INFLUENCE OF NUTRITION ON POISONS 



391 



diet could be regarded for many reasons as pellagra-producing, we 

 inquired as to the health of the patients and the duration of the 

 therapy. Dr. Bulkley replied that a number of patients lived 

 on the diet without showing any signs of pellagra. Copeman (1580) 

 tried a similar therapy with a diet that was almost vitamine-free. 

 At the time of his preliminary communication, his experiments had 

 lasted from three to four months, and a detailed report was still 

 to be made. His patients increased in weight. The dietetic treat- 

 ment of cancer is at present not in favor with the medical profession. 

 We believe that it would be of value to cancer research if this 

 disease were regarded more as a metabolic disturbance. 



'3 



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 * (ty \^ ( ^ ^ ?-> - jj,_ .,>... 



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A B 



FIG. 73. A, EHRLICH'S MOUSE CHONDROMA; B, THE SAME TUMOR GROWING IN 

 A RAT AFTER TUMOR FEEDING 



We shall now consider two problems in which the vitamines are 

 of significance with greater certainty the influence of the diet in 

 the development of teeth, and the cause of cystic calculi and similar 

 formations. 



THE DEVELOPMENT OF TEETH 



It was suspected by Kunert (1581) that the diet exerted some 

 influence on the condition of the teeth. Durand (1582) saw a greater 

 percentage of carious teeth in children who had been fed on condensed 

 milk than in those fed on breast-milk. A carbohydrate-rich diet 

 in particular, was held to be responsible for caries. Black and 



