JAMA. 1923;81(9):751-752. doi:10.1001/jama.1923.02650090049019.
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Cod liver oil is preeminently a specific in the treatment of rickets; and recently the therapeutic value of egg yolk in this disease has been emphasized by Hess.1 The curative value of egg yolk is said to be less than that of potent cod liver oil, but it is likely to prove useful in cases in which the latter may not be well borne. Both of these fat-containing foods are rich in vitamin A, a food factor essential to well-being and apparently capable of protecting some species, at least, from the occurrence of certain types of ophthalmia. In view of these parallelisms between the antirachitic and the antiophthalmic potencies of cod liver oil and egg yolk, the conclusion has been drawn that they are manifestations of the same vitamin. Certain well known facts seem, however, to be opposed to such a conclusion. It is generally admitted by pediatricians who


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