The foregoing considerations suggest the question : what is the maximum amount of nitrogenous matter which a hardworking horse can eat daily without injury to his health? From practical experience in India of feeding horses on gram (pp. 169 and 170), which is a highly nitrogenous food, I know that not more than 10 lb. of this grain can be consumed daily by an ordinary saddle horse without its upsetting his digestion and "heating" his system. In 10 lb. of gram there are about 2 lb. of nitrogenous matter, which we may take as a maximum for average sized animals. That quantity would be found in about 18 lb. of oats, 20 lb. of maize, or 7 1/2 lb. of beans. This maximum might be slightly increased in exceptional cases. In the East, highly nitrogenous foods, like gram, are used by sensible people as an exclusive grain food, only when they are unable to obtain more suitable grain, such as oats or maize. An addition of bran, owing to the comparatively large percentage of mineral matter it contains, will be desirable when highly nitrogenous grain is given to a horse in considerable quantities. In such cases, a particularly liberal supply of hay or grass should be allowed; because these articles of fodder contain a large proportion of ash.