Part 23

According to your desire, I have examined the action of the waters from the above-mentioned sources on clean lead, and have arrived at the following conclusions:--the water from Haslemere has a slow though decided action upon the metal, no effect taking place until the lead had been partially immersed for four or five days. After that time, a small deposit of carbonate of lead was perceptible at the bottom of the vessel, although none could be detected in solution. The absence of carbonic acid in the water from Haslemere, Boorley, and Barford, would in all probability prevent their acting upon lead, were atmospheric air at the same time excluded. A piece of lead that had been kept for a week in a closed bottle filled with water from Haslemere did not exhibit the least trace of carbonate of lead, nor could the presence of lead be detected in the water.

It is scarcely necessary to add, that the water as drawn from the pipes of the New River and East London Companies does not exhibit the least solvent action upon lead; when, however, purified by boiling, and placed in contact with lead, crystals of carbonate of lead were observable after the lapse of three days in the water of the New River Company, while, owing to its greater hardness, the water of the East London Company did not exhibit any traces of carbonate of lead until the expiration of more than a week, and even then only in a slight degree. The same waters purified by the patented process of Clark did not exhibit so decided an action upon lead as when purified by boiling; but after evaporating to dryness the water in which lead had been immersed for three weeks, and dissolving the residue in dilute nitric acid, the presence of a minute quantity of lead was rendered evident.

It therefore appears that if leaden pipes, and especially if leaden cisterns, are to be employed in the distribution and storage of water, on the system of interrupted supply, it will be a necessary safeguard, that the water thus conveyed and stored should not be of less hardness than from six to seven degrees, compared with distilled water as unity; and conversely, it also follows, that if the inhabitants of the metropolis are to gain the advantage of using a still purer and softer water, it will be requisite to do away with the existing leaden pipes and cisterns, and to substitute for them some material which shall not communicate any poisonous or noxious ingredient to the water. As matters now stand, we escape daily poisoning by the use of water loaded with earthy salts, and are thus compelled to drink an impure water on account of the impurity of our vessels. Would it not be better, and is it impossible, to drink the pure element from a pure cup?

I remain, dear sir, with much respect, Yours obediently,

THOMAS TAYLOR.

To JOHN SIMON, Esq., F.R.S., Officer of Health to the City of London.

THIRD ANNUAL REPORT.

November 25th, 1851.

GENTLEMEN,

I have the honour of laying before you, in the various subjoined tables, such information as will enable you to measure the present sanitary condition of the City of London.

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1. The first table (Appendix, No. I.) contains a statement of the present population of the City, as derived from the Registrar-General’s recent census; and it compares the existing numbers in each division of the City with those given at the last enumeration in 1841.

In examining this table you will observe that, during these ten years, the general population of the City has increased about 3⅖ per cent.; that this increase has not been uniform through the nine sub-districts of your jurisdiction; that in some it has been unimportant; that in others there has been an actual decrease, extending even to 4⅔ per cent. on the previous population; while in the whole East London Union the numbers have risen considerably above the aggregate rate of increase, and in the St. Botolph sub-district exceed those of the former census by more than 16 per cent.

Passing over the minor differences which have taken place in the distribution of the population, I cannot regard that larger increase without apprehension and regret. Probably for the most part it represents the continued influx of a poor population into localities undesirable for residence, and implies that habitations--previously unwholesome by their over-crowdedness--are now still more densely thronged by a squalid and sickly population.

I congratulate your Hon. Court on the recent acquisition of powers (to the nature of which I shall presently advert) for the reduction and prevention of this serious evil.

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2. The second table presents a summary of the City mortality for the year which terminated at Michaelmas last; showing the deaths, as they have occurred, male and female, during each quarter of the year, in the several districts and sub-districts of the City; and including at the foot of each column, a statement of the year’s death-rate per thousand of the living in each such district and sub-district.

Appendix, No. V. The calculated death-rates are omitted from this, as from the other annual tables:--the quinquennial rates (App. No. II.) giving more useful results.--J. S., 1854.

You will observe that, during the 52 weeks, dated from September 29th, 1850, to September 27th, 1851, there have died of the population under your charge 2978 persons; giving, for the City aggregately, a rate of nearly 23 deaths for every thousand living persons.

The rate of last year was little over 21 per thousand.

In my last Annual Report I suggested that the death-rate then prevailing was probably (from temporary circumstances) more favourable than the true average of the City; that it corresponded to the period of recovery from severe epidemic influences; that it seemed exceptional; and that you might be prepared for this year’s mortality showing again a tendency to increase.

Such has been the case; and it illustrates the necessity of appealing to cyclical averages for correct intelligence as to the healthiness of a population. To my mind the increased mortality of this year does not indicate any deterioration of the City in respect of sanitary matters under your control; it shows merely that the death-rate, which must be considered our present average for the City, is in truth higher than that which favourable circumstances, foreign to your jurisdiction, last year permitted us to attain.

Looking to the total mortality of the last three years (the period for which I have had the honour of serving your Commission), I find that 9493 deaths have taken place; which, the mean population of the time being 129,922, gives an average rate of 24·35 deaths per thousand per annum. This accords very nearly with a death-rate (24·36) deduced from the septennial period 1838-44, during which (according to the Registrar-General) 22,127 deaths occurred in a population estimated at 129,739.

Since 1841, when the Census gave these figures, the limits of the West London Union have been slightly altered. The Inner Temple and Barnard’s Inn have been added to it, while part of St. Sepulchre’s parish has been taken away.

Assuming our City mortality to be accurately represented by these averages, I need not inform your Hon. Court that such a death-rate is unduly high. I have already, in previous Reports, laid before you the materials for measuring its excess,--materials which seem to show that our existing death-rate is nearly the double of that which better circumstances have elsewhere rendered attainable.

The death-rate to which I particularly refer in the text, and which I cited in my last year’s report, is that of a large district in Northumberland, numbering 27,628 inhabitants, where, during the seven years 1838-44, the mortality was at the rate of only 14 per thousand per annum; and even in this comparatively low proportion a very distinct share might still be called preventable deaths.

It is not to the City alone of metropolitan districts that this high mortality belongs. Unhappily it affects the entire Metropolis; and we may find other towns in England, and still more on the Continent, where the death-rate is higher than under your jurisdiction. Yet your Hon. Court will not doubt that the standard to be adopted for your estimate of healthiness ought to be the lowest known death-rate; that every avoidable death represents an evil to society; and that, if a mortality of 12, or 13, or 14 per thousand per annum can be reached for one mixed population, there is ample room for discontent among any other population, which finds itself doomed to perish at double the rate of the first.

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