Some years ago (1904) the Smithsonian Institution published the collected "Researches in Helminthology and Parasitology," written by the late Prof. Joseph Leidy.1 The publication consisted of the collected essays and original investigations2 from 1844 to 1891. Unusual care was observed that the work should be complete in all details, but, as frequently occurs, owing to the vast amount of scientific literature which now burdens the transactions of our various learned societies, the title of one paper was not catalogued, and the communication was lost to the specialist interested in similar lines of investigation. The brief observations were presented under the title, "Remarks on Parasites and Scorpions, May 5, 1886."
Leidy described three specimens of worms obtained from an anemic cat, presumed to be specimens of Ankylostoma duodenale, which were sent to him by Dr. Belfield, of Chicago, for determination. He remarked:
On superficial examination I supposed the worms
LEIDY J. ANKYLOSTOMA DUODENALE: (UNCINARIA AMERICANA). JAMA. 1909;LII(23):1832. doi:10.1001/jama.1909.25420490028003
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