Many physicians are not familiar with the work which has been in progress for over fifteen years under the direction of the Commission on Standardization of Biological Stains; nor perhaps is it generally realized what services this organization is able to perform for doctors. Not all physicians use stains in their work, but even if they do not do so themselves they are quite likely to submit specimens for diagnosis to some laboratory where these products are employed. The Stain Commission proposes to see that the stains obtained by laboratories are dependable. Much of the information given here has been published before1 but not in sources readily available to the physician.
Not until after the World War, which excluded German dyes from America, did any thought of standardizing biologic stains occur to biologists. Until then it was quite generally accepted throughout the biologic world that for staining purposes the