Note 12 — Article III.—History of the Natural and Modified Small-Pox, or of the Variolous and Varioloid Diseases, as they prevailed in Philadelphia in the years 1823 and 1824. By John K. Mitchell, M. D., and John Bell, M. D. attending physicians at the then Small-Pox Hospital. With a Plate.
Reading edition
The largest proportion of these deaths was in the six months from the 1st of November, 1823, to 1st of May, 1824, being in that period about four hundred.