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These cards are intended to serve the general practitioner as a ready means of review in differential diagnosis, not only in home study, but on occasions of doubt in practice. For this purpose it is pointed out by emphasized type that "they can be carried in a pocket case or bag and referred to at any time or place." While this phrase is consonant with the laudable ostensible object of the cards, there seems to lurk in it a sinister suggestion that nefarious possibilities in the examination room are one reason for the existence of such an aid to diagnosis. The cards, 75 in number, are of different colors, according to the classes of diseases which they treat, so that the desired card may be easily selected. Their arrangement seems convenient. The innumerable errors of spelling, however—often of a very serious nature—constitute a great blemish and call for careful re-editing.
Helps to Medical Diagnosis. (A card system.). JAMA. 1909;LII(16):1279–1280. doi:10.1001/jama.1909.02540420059022
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