Public Document No. 31 



TWENTY-FOURTH ANNUAL EEPORT 



OF THE 



MASSACHUSETTS AGRICULTURAL 

 EXPERIMENT STATION. 



Part II., 



Being Part IV. of the Forty-ninth Annual Report of 

 THE Massachusetts Agricultural College. 



January, 1912. 



BOSTON: 



WEIGHT & POTTER PRINTING CO., STATE PRINTERS, 



18 Post Office Square. 



1912. 



