race-horse: "His food affects his speed and endurance, and without his nitrogenized food he would cut a poor figure at a race, because without it he could not discharge his force fast enough." WHAT IS CARBON? It is pure in the diamond, nearly pure in coal, and is the principal constituent of all woody fiber--also of oils, fat, starch, sugar, etc. Nearly all the visible organic world is composed of carbon. It appears to be very plentiful, but of our atmosphere it composes only about four-ten-thousandths, while oxygen, with which it unites to form carbonic acid gas for vegetation to feed on, composes one-fifth and nitrogen four-fifths. Really, we have little trouble in securing carbonaceous foods. The only difficulty is to get them in a digestible form. Only what is soluble can be digested and assimilated by the animal organism. Hence, great care must be taken to get food in a proper condition for animal nutrition. WHAT IS NITROGEN? It is almost pure in the albumens; both vegetable and animal. It is nearly pure in the white of egg. Hence, nitrogenous foods are quite commonly called albuminoids. It exists abundantly in all the proteins--as cheese or caseine, fibrin or lean meat, albumen, etc. Nitrogen, in its free state, appears to be an innocuous gas, diluting the oxygen and preventing it from rapidly oxydizing or burning up everything. As before said, it constitutes four-fifths of our atmosphere, but does not appear to be directly appropriated by either vegetables or animals. As food for either, it must be in combination with other elements--especially carbon--and yet it is very difficult to make it unite with other elements, and hard to maintain the union when it is once formed. Its disposition is to break these unions and seek an idle state of freedom. Hence it is that, when held in durance, its constant tendency to free itself makes it the motor force in all animal organisms, and the terrible energy in all explosives. It is secured in the form of ammonia in rain, by a process called nitrification it unites with the soil, and it exists in all decayed animal and vegetable matter in a form suitable for plant food. Men and animals get it by eating vegetables or by eating one another. It is a very abundant and important element, yet very difficult to obtain in an available form for plant and animal food. Fortunately, but comparatively little of it is needed. COMPOUNDING RATIONS. By referring to the feed tables furnished by the analysts of this country and Europe, the farmer can learn the constituents of foods. Then, knowing the ration required, he can take different foods and compound in the right proportions aimed at in feeding, whether for work, for growth, for fat, for bare maintenance, or for milk. We give the German standards for feeding animals: