Why should starch and sugar compounds be good for the sustenance of animal life while other compounds of the same elements prove destructive to life? Or, why should morphia have such a peculiar effect upon the animal tissues—especially the nervous? And why should alcohol have such a peculiar effect upon the master tissues of the body? The difference in the chemical composition of quinine and strychnine is not so very great, yet the action upon the system is by no means the same. The effect upon the tissues is not the same.
Those who believe in a God easily dispose of these questions by simply exclaiming, They are the wonderful works of God!
That one drop of hydrocyanic acid upon the tongue of an animal should kill is very astonishing; that acid being composed only of one of Carbon, one of Hydrogen, and one of Nitrogen (C N H). Why should it paralyze the brain first, before it affects the heart, since it has to be carried by the blood through the circulation to the brain? The derangement of the functions of that center causes death.
The revelations of these important combinations and actions man had to make for himself. They were not brought down to us on tablets of stone by some supernatural agent, nor did spirits or angels communicate the mysteries and the powers of these elements.
It is owing to the development of man’s intellectual faculties, that the combinations of these elements has been made possible. It was quite a discovery when it was found that nitre, sulphur, and charcoal made gunpowder. There are only five elements in that compound, viz., Nitrogen, potassium, Oxygen, Carbon, and sulphur. Chili saltpeter is used for domestic purposes. Harmless to animal life, so is each one of these elements when they enter into combinations that are not destructive to life.
The forces and powers exercised by any compound depend on the number and kind of elements that enter into the composition. And the influence that bears directly upon their mutual activity again depends, when in a state of nature, upon the presence of heat. When a seed, as of wheat or of any starchy vegetable, is thrown into the ground, it will not germinate except in the presence of a certain amount of moisture, and heat, the heat varying from 50° to 80° Fahrenheit, in addition to free communication with the air.
Temperature, moisture, air, electricity, kind and quantity of the various elements in the soil present, cause the immense variations in plant life and plant compositions. Yet the same elementary compositions will be found in the same species, and the same conditions generally will be required to reproduce them.
Each group of elements that enters into the composition of any substance, carries with it qualities and capabilities peculiar to itself, throughout the vegetable kingdom. Its influence upon the animal economy will depend on the various atomic elements, and the quantities of each, that enter its combinations. For example, the atmosphere, the balance of power between O and N, is essential to both plant and animal. So with water, O H2. And so with those foods, starch and sugars, C18H30O15 or C6 H12O6; in each of these substances Carbon has its complement of Hydrogen and Oxygen. That is, the Carbon is, as it were, diluted in a sufficient quantity of water to make it suitable for food. Rob it of its Oxygen and it becomes a poison, an active poison. The less the quantity of Oxygen in any substance of organic origin the more unfit it becomes as a food. And it becomes poisonous to the animal system in proportion as the Oxygen is absent or removed from the composition. We have representatives of poisonous substances in alcohol, C2H6O, a mild poison; and in hydrocyanic acid, C N H, the strongest poison known.
Moreover, we see already peculiar manifestations in vegetable life, humble in character, low in degree. Plants not only rest from activity, but have their sleep and exhibit sensible movement from irritation. The foliage of the locust, and of most leguminous plants, and that of oxalis and wood-sorrel, seem to have their sleep, as seen by the position of their leaves and blossoms. Irritate the mimosa plant, as by roughly touching it, and the leaflets will suddenly change position. In the Dionæa muscipula, or Venus’s flytrap, the touch of an insect, alighting upon the upper surface of the outspread laminæ, causes its sides to close suddenly, the strong bristles of the marginal fringe crossing each other like the teeth of a steel trap, and the two surfaces pressing together with considerable force, so as to retain, if not destroy, the intruder, whose struggles only increase the pressure which this animated trap exerts.
It is evident that the elementary combinations under certain conditions and the influence of heat, will exhibit vital action, in an organic form—manifest phenomena of life, that are only in degree, and not in kind, inferior to the lowest plant life. The process is the same. The mode of living differs in degree, though the results are different.