Public Document 



No. 31 



TWENTY-THIRJ) ANNUAL REPOirr 



OF THE 



MASSACHUSETTS AGRICULTURAL 

 EXPERIMENT STATION. 



Part II., 



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

 THE Massachusetts Agricultural College. 



January, 1911. 



BOSTON: 



WEIGHT & POTTER PRINTING CO., STATE PRINTERS, 



18 Post Office Square. 



1911. 



