To the Editor:—The article of Prather, Nelson and Bliss on viosterol and cod liver oil, which appeared in the July issue of the American Journal of Diseases of Children, page 52, prompts me to make the following comment with the hope of correcting an erroneous impression that the article conveyed in regard to the clinical and experimental use of viosterol. Proof of this misunderstanding may be seen in the recent advertising matter of the E. L. Patch Company and the various abstract journals that copy only the author's conclusions.
The authors of this article infer that the manufacturers of viosterol are vague about their product. This, they state, has misled the laity and the medical profession in thinking that viosterol is "a concentrated substitute for cod liver oil." In justice to the manufacturers, it must be said that their advertising and labeling of this product is in no way