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 Physicians (London); “Dictionnaire Encyclopedique des Sciences Medicales, Dechambre 100 v.,” Paris, 1864–90; “Dictionnaire des Sciences anthropologiques,” Bertillon, Paris, 1884–92; “Real Encyclopadie des gesammten Heilkunde,” Eulenburg, 22 v., Leipzig, 1893–96; and the dictionaries of Dorland, Gould, Dunglison, Quain, Billings, and Lippincott.

To several friends we desire to acknowledge our indebtedness for assistance and advice, notably to Dr. J. S. Wall, of Georgetown Medical College, and Dr. J. B. Nichols, of Columbian Medical College, who rendered valuable service in collaboration.

Finally, we might state that the work could hardly have been prepared apart from the great library of the Surgeon–General’s Office, of the excellent facilities of which we have made liberal use; and we desire here to extend our thanks to its officials for their courtesy and assistance.

, D. C., July, 1903.