LABORATORY MANUAL 



OF 



A YEAR IN SCIENCE 



JOSEPH L. THALMAN, A.M. 



FORMER HEAD OF BIOLOGY DEPARTMENT, OAK PARK AND RIVER 



FOREST TOWNSHIP HIGH SCHOOL ; PRINCIPAL OF 



HIGH SCHOOL, NEW CASTLE, PA. 



AND 



ADA L. WECKEL, M.S. 



HEAD OF BIOLOGY DEPARTMENT, OAK PARK AND RIVER FOREST 

 TOWNSHIP HIGH SCHOOL, OAK PARK, ILLINOIS 



CHICAGO NEW YORK 



ROW, PETERSON AND COMPANY 



