GENERAL BIOLOGY 



717 



BY 



LEONAS LANCELOT BURLINGAME 



ASSOCIATE PROFESSOR OF BOTANY AND GENETICS 



HAROLD HEATH 



PROFESSOR OF ZOOLOGY 



ERNEST GALE MARTIN 



PROFESSOR OF PHYSIOLOGY 

 AND 



GEORGE JAMES PEIRCE 



PROFESSOR OF PLANT PHYSIOLOGY '• A [{' 



AT STANFORD UNIVERSITY 



siim^ 



NEW YORK 

 HENRY HOLT AND COMPANY 



