Part 57

18. Mr. Lally having received a fresh supply of barometers on the evening of the 23d, resumed his survey of the height of land on the 25th September, and reached the camp of the commissary on Mount Biort on the 2d October, having surveyed and leveled the intermediate dividing ridge. The party of H.B. Renwick descended the Abagusquash and Tuladi, and, crossing Lake Temiscouata, reached the same rendezvous on the 5th October. The interval was spent by Mr. Lally's party in clearing a space for a panoramic view on the summit of Mount Biort.

19. The commissioner, having superintended in person the equipment and embarkation of the parties of Messrs. H.B. Renwick and Lally on Lake Temiscouata, returned to the river Du Loup for the purpose of making astronomic observations. These being completed, he visited and conferred with the parties of his colleague, A. Talcott, esq., on their way to the height of land southeast of Kamouraska. Here he made arrangements for the junction of the two lines on the Temiscouata portage. He then proceeded to the camp of the commissary on Mount Biort, and there made provision for the completion of the residue of the line in the vicinity of the portage. He also selected points of view for the use of the daguerreotype and camera lucida, and, being unable to do any more on the ground for the furtherance of the objects of his appointment, returned to New York, taking with him the earlier records of the field operations for the purpose of organizing the office work.

20. Under the direction of Mr. H.B. Renwick, a party led by Mr. Lally set off from Mount Biort on the 7th October, and, proceeding westward along the portage road to the ridge of Mount Paradis, turned to the south along the dividing ridge. This being pursued led them back to the portage at a point about 21-1/2 miles from the river Du Loup on the 10th. The dividing ridge was now found for some distance to coincide nearly with the portage road and to pass over the summit of the Grande Fourche Mountain, a fact which had not before been suspected. The source of the Grande Fourche of Trois Pistoles having been headed, the party reached a station which the commissary had now established at the river St. Francis on the 13th October. Departing from this, the basin of the St. Francis to the north of the portage road was explored, and the survey finished on the 17th October.

Operating from the St. Lawrence as a base, and within reach of a cultivated country, whence numerous roads are cut to the height of land, it would have been possible to have kept the field for perhaps a fortnight longer. The plans and estimates of the division had been made with this view, and it was anticipated that the height of land might have been surveyed 30 miles to the south of the Temiscouata portage. Although this would have been practicable, it would have been a service of hardship. The necessity for this was obviated by the progress of the parties of A. Talcott, esq., which completed their surveys up to the portage on the same day that the surveys of this division were finished.

22. The circumstances under which the latter part of the survey was performed from the time of leaving the river Du Loup, on the 3d September, were far less favorable than had been experienced on the Metis and its branches. The continual drought had at the beginning of this part of the duty affected the streams and springs in such a way as to render navigation difficult and water for drinking scarce on the heights of land to which the survey was necessarily directed. On the eastern side of Lake Temiscouata a large fire had extended itself into the woods. On the Temiscouata portage the persons in charge of that road had set fire to the brush and wood cut in opening it out to an increased breadth, and a belt of flame 30 miles in length was at each change of wind carried in some new direction into the dry forest. The camp and collection of stores on Mount Biort were thus threatened for several days, and only saved by great exertions. Serious apprehensions were entertained lest the return of the parties in the field might be obstructed by the spreading of their own fires. The smoke of this vast extent of combustion obscured the heavens and rendered astronomic observations difficult or prevented it altogether. Finally, a season of unprecedented drought was closed on the 24th of September by the setting in of the equinoctial storm, and from this day until that on which the survey terminated few hours elapsed without rain, sleet, or snow. In spite of these obstacles, it is believed that the State Department will have no reason to be dissatisfied with the results of the campaign.

23. The results of the operations of this division are embodied in a map and profiles, which are herewith presented. The degree of reliance to be placed on this map will be best understood from a detail of the methods employed in preparing it.

The river Metis and its branch, the Mistigougeche, were surveyed by an azimuth compass of Smallcaldus construction, and the distances measured by a micrometric telescope by Ertil, of Munich. The courses of the rest of the lines were determined by compasses of similar construction, and the distances measured by chains of 100 feet constructed by Dollond, of London, and Brown, of New York. An exception to this general rule exists in the survey of the eastern side of Rimouski. The courses and distances thus measured, and corrected for the variation of the compass, were compared with astronomic observations for latitude and with longitudes deduced from chronometers. For this reason, as the line on the east side of Rimouski is almost in the direction of the meridian, it was not considered necessary to lose time in measuring it when the latitude of the several camps, determined by observations of the pole star, were taken nightly.

The latitudes of the courses under the direction of Mr. H.B. Renwick were determined by a reflecting repeating circle of Dollond; those on Mr. Lally's by a good sextant. The latitudes and times at Grand Metis, the river Du Loup, and the stationary camp on Mistigougeche and Abagusquash were principally determined from observations made with the Dollond circle. Lunar transits were taken at the river Du Loup, and distances of the moon for longitude at several places on the line. The reliance for the longitudes was, however, principally upon timekeepers, and of these the party was furnished with one box and two pocket chronometers by Parkinson & Trodsham, one pocket chronometer by Molyneux, one by French, one by Barraud, and one by Morrice. Thus, while several could be retained at the station, each party in the field was furnished with two, and the measured distance furnished a check, which, in case of discrepancy, that on which greatest reliance could be placed might be ascertained. It is sufficient to say that the deductions have been in general satisfactory, although the rough motion to which these instruments were subjected in passing through pathless woods, embarrassed by fallen trees and morasses in which the bearers often sunk to the middle, caused changes of rate and even sudden variations. Uncertainty arising from these causes was rendered less to be dreaded from its being possible to refer, as a base of operations, to the excellent survey of the St. Lawrence River by Captain Byfield, of the British navy. With the geographical positions given in his charts our own observations agreed so closely as materially to confirm the respective accuracy of both.

24. The point which in this part of the survey has been kept in view as most important is the determination of the heights. For this purpose the party of Professor Renwick was furnished with the following barometers:

Two loaned by the Superintendent of the Coast Survey, of his own construction; two portable and one standard, by Neurnan; three of the siphon form, by Buntin, of Paris; one by Traughton & Simms; one by Forlin, of Paris; three of siphon form, by Roach & Warner, of New York; two by Tagliabue, of New York, originally on the plan of Durand, but which had been advantageously altered by Roach & Warner in such manner as to admit of the adjustment of the level of the mercury in the cistern.

The stations at which the lower barometers were placed were Grand Metis until the return of the expedition up the river of that name, and the river Du Loup from that time until the close of the survey. At these places all the barometers not actually in the field were suspended and registered at the hours most likely to correspond with the observations of a traveling party, say at 6, 7, 8, and 9 in the morning, noon, 1, 5, and 6 in the afternoon, until as the season advanced and the days became short the earliest and latest of these hours were omitted. Although several barometers were thus constantly observed, no other use of these was made but to determine their comparisons with each other, except one of the barometers of Mr. Hassler, Superintendent of the Coast Survey. This, from its superior simplicity, being, in fact, no more than the original Tonicillean experiment, with a well-divided scale and adjustment of its 0° to the surface of the mercury in the cistern, was found to be most certain in its results. All the barometers used by the parties in the field were therefore reduced to this by their mean differences.

The stations at the two above-mentioned places were near the St. Lawrence. At Metis the height of the cistern of the standard barometer was determined by a spirit level. At the river Du Loup the height of the station was determined by two sets of observations of barometers, taken with different instruments by different observers, and at an interval of a week from each other. The results of the two several sets, which were calculated separately, differ no more than 0.5 of a foot from each other.

On reaching the highest accessible points of the streams on which the parties proceeded toward the height of land, stationary camps were established, as has been already stated. At these series of observations were made at the same hours as at the river stations. The height of the former was then calculated from a series of observations taken at noon and at 1 p.m. for the whole of the time the camp was occupied. The heights of the points at which observations were made by the traveling party were then deduced from a comparison with the nearest contemporaneous observations at the stationary camp. An exception to this rule was made in the observations to the westward of Temiscouata Lake, which were referred directly to those made at the river Du Loup, which was sufficiently near for the purpose.

The height of the stationary camp at Mount Biort having been determined by observations continued for several days, the level of Lake Temiscouata was thence determined by using a set of levels taken with a theodolite by Breithaupt, of Cassel, in 1840. The height of the lake thus deduced is greater than it would appear to be from the barometric observations taken in December, 1840. It had been imagined that a difference in level might exist between the St. Lawrence at Metis and at the river Du Loup. Four days of contemporaneous observations were therefore made at each with a view to the solution of this question. The idea of a difference of level was not sustained by the operation.

The heights of the river stations were measured in each case to the highest mark left by spring tides, and half the fall of that tide as given by Captain Byfield has been added in all cases as a reduction to the mean level of the sea. Opportunities were offered in a few instances for testing the accuracy of the method by different barometers used by different observers at different days on the same point. No discrepancy greater than 7 feet has been thus discovered. In other cases the same observer returned and observed at the same places, and here a similar congruity of result has been found to exist.

The whole of the calculations have been made by the formulae and tables of Bailey. Before adopting these their results were compared in one or two instances with those of a more exact formula. The differences, however, were found so small as to be of no importance, amounting in the height of Lake Johnson to no more than 5 feet in 1,007. The original record of the barometric observations, each verified by the initials of the observer, have been deposited in the State Department.

25. The paths pursued by the traveling parties were marked by blazing trees. The position of the barometer at each place of observation was also marked. The operation was a search for the boundary line in an unknown country, hence it rarely happened that the path of the parties has pursued the exact dividing line of the waters of the St. Lawrence and the Atlantic, but has been continually crossing it. The maps herewith submitted and the marks by which the line of the survey has been perpetuated would have enabled a party sent out for that especial purpose to trace the boundary on the ground without difficulty other than that arising from the inacessible character of the country.

26. The commissioner can not speak in too high terms of the industry and perseverance manifested by the engineers and surveyors employed on this division, and in particular of the skill and intelligence of the two first assistants. Circumstances had prevented the receipt of portable astronomic instruments which had been ordered from Paris and Munich, and an instrument formed by the adaptation of a vertical circle to the lower part of an excellent German theodolite by Draper, of Philadelphia, was found on its being opened at Metis to have received an injury which rendered its accuracy doubtful. The whole reliance for the greatest accuracy was thus thrown on the repeating circle of Dollond. Such, however, was the address and skill of the engineer to whom it was intrusted that he not only fulfilled the object for which it was intended, of determining the position of the points visited by the traveling parties, but accomplished the same object at the stationary camps and at the river stations, without delaying for an hour the operations of the survey.

The duty which these gentlemen performed was arduous in the extreme. It has been seen that on the expedition up the Metis a seasoned voyageur had been worn out by the severity of his labors; on the Tuladi half the men were sick at a time; and of Mr. Rally's party two Penobscot Indians of herculean frame were compelled to return by extreme fatigue. The engineers, while in the field, were even more exposed to fatigue than the laborers, for they carried their own baggage and instruments, and were engaged nightly in observation and calculation, while the workmen could repose.

27. The commissioner to whom the survey of the northern division of the boundary line was intrusted has to express his acknowledgments for the politeness and good offices of the authorities of Her Britannic Majesty. In compliance with his request, permission was granted by the late lamented Governor-General for the admission of a vessel and the entry of the stores, camp equipage, and instruments of the party at one or more ports on the St. Lawrence. Letters were addressed by the principal secretary of the colony of Canada to all the officers and magistrates, directing them to give every facility to the operations, and these directions were obeyed, not as mere matters of form, but with a truly hospitable spirit. To the officers of the Sixty-eighth Regiment, forming the garrison of Fort Ingall and occupying the post of the river Du Loup, as well as to the officers of the commissariat on duty at those places, acknowledgments are due for numerous attentions.

II.--Operations of the year 1842.

1. Of the task originally assigned in the instructions for this division there remained to be completed--

(1) A portion of the boundary claimed by the United States around the head waters of the river Rimouski.

(2) The line of highlands forming the south bounds of the Province of Quebec, extending from the north shore of the Bay of Chaleurs at its western extremity.

2. Experience had shown that the portion of the boundary which remained unsurveyed could not be reached with any hope of completing the survey by any of the streams running into the St. Lawrence nor from the waters of Lake Temiscouata. The Green River (of St. John) was therefore chosen as the line of operation. It was known that a portage existed between its boatable waters and those of the Grande Fourche of Restigouche. The plan for the work of the season was therefore laid as follows:

To proceed up Green River with a party, thence to cross to the Bell Kedgwick by the portage, and having, by expeditions from the banks of that stream, surveyed the remainder of the claimed boundary, to fall down the stream to the Bay of Chaleurs, and, ascending the highland measured in 1840, to proceed along the heights in order to reach if possible the northwest angle of Nova Scotia.

The work being the most remote and difficult of access of any on the whole boundary, it was necessary to take measures early, and, it being apparent that if they were not vigorously pressed the whole summer's work would be frustrated, permission was granted by the Secretary of State to prepare stores and provisions, and the party was sent forward toward its line of operations. Care was, however, taken, in conformity with his instructions, to secure means of communication.

3. The transportation of stores, equipage, and instruments was rendered unexpectedly easy by a steamboat running from Portland to St. John, and by the politeness of the British consul at Portland and the collector of Her Britannic Majesty's customs at St. John free entrance was permitted at the latter port. These articles were shipped from Portland the 19th of June and under the charge of the Hon. Albert Smith reached the Grand Falls of St. John July ----.