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.