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Agricultural chemistry must be carried to a much higher degree of perfection than it is likely to reach in the next ten centuries at least, to determine whether any particular plat of ground has been chemically balanced for the growth of wheat, to the exclusion of other cereal crops. Besides, the process of soil-balancing might be altogether too expensive to be indulged in by judicious husbandry.
So far you have been content to use the mechanical power of water, its momentum or dead weight merely; to attain a much higher civilization, you must break it up chemically and use its constituent gases." "How," asked Bearwarden, "can this be done?"
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They feel more like the harsh, loaded silks made from thread which has been chemically weighted. But they are coming into demand more and more for such purposes as the warp and filling of various sorts of fabrics, rugs, silk stockings, and upholstery materials.
It is often the case that food containing less actual nourishment will give greater nourishment to the body than chemically richer food, because the former fits the state of the digestive system better. What each one must consider is, not what food has most of the chemical elements needed by the body, but what food will give up to his own body the most of these elements.
The most deadly poison may be chemically undistinguishable from substances which are perfectly innocent. Prussic acid, we are told, is formed of the same elements, combined in the same proportions, as gum-arabic. What that belief is for which the fruits speak thus so positively, it is less easy to define. Religion from the beginning of time has expanded and changed with the growth of knowledge.
When, as in the case of smallpox or cowpox, the germ has not yet been detected, what you inoculate is simply undefined matter that has been scraped off an anything but chemically clean calf suffering from the disease in question. You take your chance of the germ being in the scrapings, and, lest you should kill it, you take no precautions against other germs being in it as well.
You do not know how many wines there are in the soup, because you do not know how many wines there are in the world. And you never will know, because all chemists, all cooks, and all common-sense people tell you that the soup is of such a sort that it can never be chemically analysed. That is a perfectly fair parallel to the hereditary element in the human soul.
Yet, further, it is well to take notice of the fact that there are many vegetarian wild animals which do not hesitate to eat certain soft animals or animal products when they get the chance. Thus, both monkeys and primitive men will eat grubs and small soft animals, and also the eggs of birds. Whilst the cat tribe, in regard to the chemical action of their digestive juices, are so specialised for eating raw meat that it is practically impossible for them to take vegetable matter as even a small portion of their diet, and whilst, on the other hand, the grass-eating cattle, sheep, goats, antelopes, deer and giraffes are similarly disqualified from any form of meat-diet, most other land-mammals can be induced, without harm to themselves, to take a mixed diet, even in those cases where they do not naturally seek it. Pigs, on the one hand, and bears, on the other, tend naturally to a mixed diet. Many birds, under conditions adverse to the finding of their usual food, will change from vegetable to animal diet, or vice-versâ. Sea-gulls normally are fish-eaters, but some will eat biscuit and grain when fish cannot be had. Pigeons have been fed successfully on a meat diet; so, too, some parrots, and also the familiar barn-door fowl. Many of our smaller birds eat both insects and grain, according to opportunity. Hence it appears impossible to base any argument against the use of cooked meat as part of man's diet upon the structure of his teeth, or upon any far-reaching law of Nature which decrees that every animal is absolutely either fitted (internally and chemically, as well as in the matter of teeth) for a diet consisting exclusively of vegetable substances, or else is immutably assigned to one consisting exclusively of animal substances. There is no
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