TWENTIETH CENTURY TEXT-BOOKS 
A 
LABORATORY MANUAL 
OF BOTANY 
OUTLINES AND DIRECTIONS FOR LABORATORY AND 
FIELD-WORK IN BOTANY IN SECONDARY SCHOOLS 
BY 
OTIS W. CALDWELL, Pn. D. 
PROFESSOR OF BOTANY IN THE EASTERN ILLINOIS 
STATE NORMAL SCHOOL 
NEW YORK 
D. APPLETON AND COMPANY 
1902 
