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May 22, 1943


Author Affiliations

Edgewood Arsenal, Md.

JAMA. 1943;122(4):251. doi:10.1001/jama.1943.02840210043018

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To the Editor:—  With reference to the article "The Phenomenon of 'Black Dermographism' " by Urbach and Pillsbury in The Journal, February 13, any one sufficiently interested in the subject to attempt to analyze the data presented may find them rather confusing. Data of this sort should, if accurate and properly presented, contribute to an ultimate solution of the phenomenon on theoretical grounds. I should like to suggest in passing, however, that the explanation is to be found in an analytic study of the reactions and deposit on the skin rather than through a study of the materials which may or may not "prepare" the skin for the test.As to my criticism of the clarity of the article, particular reference is made to the second paragraph on page 487, which is quoted here for reference: "Table 6 shows how differently the various salts of the same metal used in preparation

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