Baltimore, June 14, 1902.
To the Editor:
—My attention has been called to an error in my address on the "History of the Ophthalmoscope," published in the issue of March 1, 1902. On page 551, the loan of Ruete's ophthalmoscope is incorrectly ascribed to Dr. Jeffries. Dr. Hasket Derby of Boston loaned this rare instrument and a number of others, and has since then given them to the Museum of the Surgeon General in Washington. Yours,