[MENCKEN, H. L.] LEONARD KEENE HIRSHBERG. What You Ought to Know About Your Baby. New York, 1910. Small 8vo, original lettered green cloth, slight wear to extremities; front panel from original dust jacket and other remnants laid-in. FIRST EDITION OF THIS RARE BOOK GHOST-WRITTEN BY MENCKEN, PRESENTATION COPY, inscribed by Mencken on the front free endpaper: "For Ralph Colin Dreiser, then editor of the Delineator, asked me to find a Johns Hopkins man to write a series of articles on the nature and policing(?) of children. I found Hirshberg. He prepared the material and I worte the copy. More than 125,000 American mothers, using this invaluable text, have saved their brats from smallpox, arterio-sclerosis, poison-vol and delirium tremors. This has been my sole contribution to the salvation of humanity. H.L. Mencken In the Colin house March 14, 1945."