Before and after muscular exertion honey should be given in a generous dose; no coachman would allow his horses to run for hours without giving them food at the resting intervals. Only man is so unreasonable as to undertake heavy exertions often with an empty stomach. No wonder that so many sportsmen get a weak heart simply for just such a reason. The use of sugar cannot well replace honey. In the same amount sugar is chemically irritating to the stomach. At any rate the preference should be given to cane-sugar; sugar of beet-root is chemically pure, although through modern civilization it is, unhappily, deprived of the important mineral salts the beet-root contains, and it has also been shown that through the use of chemically pure sugar the body loses in lime, which is eliminated in larger quantities. If honey is alone taken in larger dose it is better borne if water is drunk afterward. Besides honey I like to recommend grapes, as containing much sugar and also valuable mineral salts like lime. If grape cures as conducted, for instance, in Meran (Tyrol) give good results in arteriosclerosis and heart cases, the results I think could be explained by the above observations. We can best introduce lime in our bodies through milk, cheese, eggs, fruits, and vegetables. The latter, especially fruits, are also rich in sodium and potassium, which are also valuable elements for the activity of the heart. I would especially insist upon the fact that the heart-muscle is rich in lime, as it contains about seven times as much of it as the other muscles. If we introduce in our system fresh, uncooked milk and eggs we also introduce a very valuable substance of which we have spoken before, vitamines. I believe that these substances must be very valuable for the activity of the heart because in all the diseased conditions, the deficiency diseases, arising, we have found, a want of this substance (Funck). Besides, in nervous troubles a weakness of the heart and muscles is common. If in one of this class of diseases, like beriberi, even in the latent cases, strong muscular exertions are made, then cardiac attacks will appear with great weakness of the heart. According to Funck, chief of the laboratory of the London Cancer Research Institute, muscular exertions are apt to make these diseases break out at once in cases, until then latent, without any symptoms. He also impresses upon the fact that when vitamines are wanting in the food, it is the vitamine stores of the muscles which are attacked first (Funck, “Die Vitamine,” Wiesbaden, 1914). But as the best proof for my opinion that food containing vitamines is indisplaceable for the heart-muscle I mention the fact, determined by Cooper and quoted by Funck, _Journal of Hygienics_, 1913, that the heart-muscle is very rich in vitamines. Beriberi and other deficiency diseases are the highest degree of a condition that is due to the entire want of vitamines in the blood.