I have already mentioned that the amount of muscle tissue and the amount of adipose tissue of the body must be estimated from two altogether different standards. The two are to a very great extent independent of one another. We learn this from daily experience; for we frequently encounter very muscular men who have very little fat, and, on the other hand, obese subjects with a very scanty muscular development. It is well also to recall the fact mentioned in a previous lecture that the albumen content of the body may become increased while at the same time the adipose tissue becomes decreased and the weight reduced. The increase of the muscular and of the fat layers must, therefore, be discussed separately.