Part 44

Therefore the crude Earth, being their Food, simple and free from any Alterations by Vessels, remaining insipid, cannot give, neither can Plants receive, require, or make use of, any Variety from it, as Animals do from their Diet. It would be lost upon them, and Nature would have acted in vain, to give Smell and Taste to Vegetables, and nothing but insipid Earth for an Object of them; or to give them a charming Variety of Relish and Savour in their Food, without giving them Senses necessary to perceive or enjoy them; which would be like Light and Colours to the Blind, Sound and Music to the Deaf, or like giving Eyes and Ears to Animals, without Light or Sound to affect them.

The Mouths of Plants, situate in the convex Superficies of Roots, are analogous to the Lacteals, or Mouths, in the concave Superficies of the Intestines of Animals.

These spongy Superficies of animal Guts, and vegetable Roots, have no more Taste or Power of refusing whatever comes in Contact with them, the one than the other.

The free open Air would be equally injurious to both; and if exposed to it, it would dry and close up the fine Orifices in Guts and Roots: Therefore Nature has guarded both from it.

Nature has also provided for the Preservation of both Vegetables and Animals (I do not say equally) in respect of their Food; which might poison them, or might not be fit to nourish them.

The Security of Plants (the best that can be) is their Food itself, Earth; which, having been altered by no Vessels, is always safe and nourishing to them; For a Plant is never known to be poisoned by its own natural Soil, nor starved, if it were enough of it, with the requisite Quantities of Heat and Moisture.

Roots, being therefore the Guts of Plants, have no need to be guarded by Senses; and all the Parts and Passages, which serve to distinguish and prepare the Food of Animals, before it reach the Guts, are omitted in Plants, and not at all necessary to them.

But as the Food of most Animals is Earth, very variously changed and modified by vegetable or animal Vessels, or by both, and some of it is made wholsome, some poisonous; so that if this doubtful Food should be committed to the Intestines, without Examination, as the pure unaltered Earth is to Roots, there would, in all Probability, be very few Animals living in the World, except there be any that feed on Earth at first Hand only, as Plants do.

Therefore, lest this Food, so much more refined than that of Plants, should, by that very means, become a fatal Curse, instead of a Blessing to Animals, Nature has endowed them with Smell and Taste, as Sentinels, without whose Scrutiny these various uncertain Ingredients are not admitted to come where they can enter the Lacteals, and to distinguish, at a sufficient Distance, what is wholsome and friendly, from what is hurtful; for when ’tis once passed out of the Stomach into the Guts, ’tis too late to have Benefit from Emetics; its Venom must then be imbibed by the Lacteal Mouths, and mix with the Blood, as that must mix with the Sap, which comes in Contact with the Lacteals in the Superficies of Roots, Nature having left this unguarded.

Yet Plants seem to be better secured by the Salubrity and Simplicity of their Food, than Animals are by their Senses: To compensate that Inequality of Danger; Animals have Pleasure from their Senses, except some miserable Animals (and such there are) that have more Pain than Pleasure from them. But I suppose, more Animals than Plants are poison’d; and that a poisonous Animal is less fatal to a Plant, than a poisonous Plant is to an Animal.

It being sufficiently proved, that every sort of Vegetables, growing in the same Soil, takes, and is nourished, by the same Sort of Food; it follows from hence, that the beneficial Change of Sorts of Seeds or Plants, we see in the common Husbandry, is not from the Quality of the Sorts of Food, but from other Causes; such as,

I. Quantity of the Food.

II. Constitution of the Plants.

III. Quantity of the Tillage.

In Dr. Woodward’s Case, upon his Hypothesis, the Three Proportions of Seeds, viz. Barley, Oats, and Pease, might be sown all together in the same Acre of Ground, the same Year, and make Three as good Crops as if sown singly in Three successive Years, and his Two Crops of Wheat in one Year likewise. But every Farmer can tell, that these Three Proportions of Seed would not yield half the Crop together, as one would do single; and would scarce produce more than to shew what Grains were sown, and which, of the Sorts were the strongest and the most able Robber.

Though this Failure would, in Truth, be from no other Cause than want of the sufficient Quantity of Food, which those Three Crops required; yet, perhaps, the Doctor might think, that all Three Crops might succeed together very well, taking each its proper Nourishment, were it not for want of Room, Air, and Sun.

I have been credibly inform’d, that on One Perch of Ground there has grown a Bushel of Corn, which is Twenty Quarters to an Acre. Mr. Houghton relates Twenty-six, and even Thirty Quarters, of Wheat on One Acre. There have certainly grown Twelve Quarters of Barley to an Acre, throughout a whole Field: Therefore, unless a Crop exceed the least of these, or indeed the greatest of them (if the Relation be true), a Crop cannot fail for want of Room; for one Acre (be it of what Nature it will, as to the Soil of it) must have as much room for a Crop to grow on, as any other Acre.

Then there was room for all Dr. Woodward’s Three Crops together, to produce as much as Three common Crops do. Yet all these together will scarce yield one Quarter of Corn, tho’ there is room, at least, for Twelve.

The same Air and Sun that had Room to do their Office to Mr. Houghton’s Acre, why should they not have Room to do the same to Doctor Woodward’s Acre, when the Three Crops growing on it at once, through pretty good ones, might require less Room than Mr. Houghton’s Crop did?

I perceive that those Authors, who explain Vegetation, by saying the Earth imbibes certain Qualities from the Air, and by specific Qualities, and the like, do also lay a great Stress upon the perpendicular Growth of Vegetables; seeming to fansy there is little else necessary to a good Crop, but Room.

Mr. Bradley, in his Arguments concerning the Value of an Hill, does implicitly say as much.

But if they would but consider the Diameters of the Stems, with the Measure of the Surface of an Acre, they would be convinced, that many, even of Mr. Houghton’s Crops, might stand in a perpendicular Posture upon an Acre, and Room be left.

One true Cause of a Crop’s failing, is want of a Quantity of Food to maintain the Quantity of Vegetables, which the Food should nourish.

When the Quantity of Food which is sufficient for another Species (that requires less), but not for that which last grew, to grow again the next Year, then that other is beneficial to be planted after it.

The Second true Cause is from the Constitution of Plants; some require more Food than others, and some are of a stronger Make, and better able to penetrate the Earth, and forage for themselves.

Therefore Oats may succeed a Crop of Wheat on strong Land, with once plowing, when Barley will not; because Barley is not so well able to penetrate as Oats, or Beans, or Pease, are.

So a Pear-tree may succeed a Plum-tree, when another Plum-tree cannot; because a Pear is a much stronger Tree, and grows to a much greater Bulk; so inclined to be a Giant, that ’tis hard to make it a Dwarf; and will penetrate and force its Way thro’ the untill’d Earth, where the other cannot; being of a weaker and less robust Constitution, not so well able to shift for itself.

The Pear could penetrate Pores, that the other could not. Mr. Evelyn says, in his Discourse of Forest-trees, ‘That a Pear will strike Root thro’ the roughest and most impenetrable Rocks and Clifts of Stone itself.’ He says likewise, in his Pomona, ‘That Pears will thrive where neither Apple or other Fruit could in Appearance be expected.’