[From the 22d Annual Report of the Secretary of the Mass, State Board of Agriculture,] 



OBSERVATIONS 



THE PHENOMENA OF PLANT LIFE. 



A PAPER 



PRESENTED TO THB 



MASSACHUSETTS BOAED OP AGEICULTUEE, 



BY W. S. CLAEK, 



II 



PRESIDENT OF THE MASSACHUSETTS AGRICULTURAL COLLEGE. 



BOSTON: 



WRIGHT & POTTER, STATE PRINTERS, 



79 MILK STREET (CORNER OP FEDERAL). 



1875. 



