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Biological Laboratory, E. I. duPont de Nemours and Company, New Brunswick, New Jersey
A study was made of the extent to which dl-methionine and sardine fish meal are able to supplement a chick ration containing proteins from corn and soybeans only. Such a diet appears to be lacking in an unknown growth factor which is present in sardine fish meal. There is some evidence that the need for this factor is a peculiarity of the corn-soybean diet.
2 Present address, Upjohn Company, Kalamazoo, Michigan.
Manuscript received 5 November 1945.