A DIETARY DEFICIENCY CANINE DISEASE—FURTHER EXPERIMENTS ON THE DISEASED CONDITION IN DOGS DESCRIBED AS PELLAGRA-LIKE BY CHITTENDEN AND UNDERHILL AND POSSIBLY RELATED TO SO-CALLED BLACK TONGUE
The authors feel that the diet fed by Chittenden and Underhill contained an insufficient amount of vitamins A and B. They have fed various diets which produced the disease in varying periods. The authors study of the disease suggests that it is neither scorbutic in character nor due to lack of inorganic salts. Butter fat shows some curative properties, but in some experiments butter fat fails to bring about curative effects; the quality of the butter seems to be of importance. The potency properties of butter fat are diminished by refrigeration. Cod liver oil failed to restore the diseased dogs. Boiled carrots were even more effective in curative properties than butter fat. The experiments lend support to the conception that naturally occurring pigmentary substances in foodstuffs play a role in nutritive processes.