The Effect of BC-48 (Demecarium Bromide) on Normal Rabbit and Human Eyes* *From the Department of Ophthalmology, Graduate School of Medicine of the University of Pennsylvania, and the Research and Clinical Departments of the Wills Eye Hospital. Presented in part at the Eastern Section meeting of the Association for Research in Ophthalmology, New York University-Bellevue Medical Center, New York, November 21, 1958. BC-48 used in this study was provided by Merck, Sharp & Dohme, Research Laboratories, Division of Merck & Co., Inc., West Point, Pennsylvania, through the courtesy of Dr. Edmund W. J. DeMaar. Trade name: Humorsol.