Public Document No. 31 



TWENTY-FIRST ANNUAL REPORT 



OF THE 



MASSACHUSETTS AGEICULTURAL 

 EXPERIMENT STATION. 



Part II., 



Being Part IV. of the Forty-sixth Annual Report 

 OF THE Massachusetts Agricultural College. 



January, 1909. 



BOSTON: 



WEIGHT & POTTEE FEINTING CO., STATE PEINTEES, 



18 Post Office Square. 



1909. 



