The reply is easy: the vegetable kingdom disposes of a variety of stimulating articles, such as tea, coffee, kola and cocoa. Through their active substances these foods are nerve tonics of the first order, less dangerous in their use than meat, because more easily assimilated, of far more continuous effects, less mixed with other substances, sometimes noxious, and consequently more measurable. Besides, in pulse food, quantities of purins are found as important as in meat. If the part they play has not been systematically studied from the point of view of their effects on the nervous organism, they still give rise to the same terminal products, such as uric acid. One can quite well argue that the pulse purins have physiological effects comparable to those of meat purins. On the other hand, vegetable purins have the considerable advantage of being less easily precipitated in the urine, after the human interorganic metabolism, than those resulting from the metabolism of flesh material. This explains why a frequent use of a vegetable diet offers appreciable advantages in the amelioration of arthritic diatheses so common amongst us. Certain effects observed in these diatheses arise from the purins, from their localisation in the system, and their vitiated metabolism. The use of a moderate vegetable diet is the best means of treatment in order to relieve, to ameliorate, even to cure, arthritic diathesis. IX Such are the certain physiological advantages which the predominant use of vegetable products are capable of offering. If one takes the pure energy-producing point of view, the superiority of the vegetarian diet becomes greater still. From the fine works of A. Chauveau, modern physiology has shown us that muscle, in working, consumes sugary materials. These are provided by ingestions of sugar in a natural state, of dextrine or of starch; for a less important part, the glycogen of the system may also arise from hydrocarbonated cords existing in the molecule of certain albumins. Therefore it is only in an infinitesimal part, due to the fibrine of meat, and to the small proportions of glycogen which it contains, that flesh diet intervenes in the direct production of kinetic energy. The demonstrations which have been essayed, touching the muscular superiority of vegetarians, appear superfluous to us. Such experiments could only have a positive value if they were made on both series of antagonistic subjects, with alimentary powers of energy-producing equality. It should be distinctly understood that the vegetarian does not profit by any mysterious forces. The habit of preferring to nourish oneself with vegetable foods, can, at most, or at least, favour the physiological integrity of the subject, shield him against disease and assure his revictualment with foods recognised as active and easily measurable.