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Karl von Ruck, M.D.
JAMA. 1891;XVI(26):921-922. doi:10.1001/jama.1891.02410780021009.
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To the Editor:  —I note the report of Dr. Joseph Jones, of New Orleans, La., upon the analysis and examination made by him of Professor Koch's lymph, now called tuberculin, which appeared in your issue of May 30.Without in the least desiring to appear as the champion for the lymph, the extraordinary statements made by Dr. Jones in this report, led me to reply to his claims of having found living tubercle bacilli, or at least such as resembled and behaved similar to the bacilli of tuberculosis.Many similar analyses have been made and published before and since Dr. Jones began his investigations, but strange to say in none of the numerous experiments made in the physiological and bacteriological laboratories of Europe and other countries have ever any living germs been found to be present in the fluid.Dr. Jones says, that upon the dilution of the lymph with


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