Presented to the Section ria Medica, Pharmacy and Thera- 
peu gre at ben Forty-e nee peel Meeting of the American Med- ; 
Association, held at Philadelphia, Pa., June 1-4, 1897. : “ 
BY WILLIAM TRELEASE, Sc.D 
DIRECTOR OF THE MISSOURI BOTANICAL GARDEN. 
ST. LOUIS, MO. 
he REPRINTED FROM THE 
JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION, 
SEPTEMBER 4, 1 
