55 



many plums rotted and fell from both during tlie sum- 

 mer. On August 22 tlie plums were removed. 



From the sprayed tree (No. 465) I took 477 ^plums, 

 weighing Hi pounds. These averaged a little smaller 

 than those from the check tree, and the skins] of some 

 showed a peculiar roughness due either to a caustic action 

 of the mixture, or else is simply a peculiarity of the tree. 

 As the fruit of the trees have not before been compared, 

 it is not safe to decide about this. I have never wit- 

 nessed any similar effect from spraying grapes and 

 apples, though it may prove that plums are more sensi- 

 tive to the copper and lime. 



The unsprayed check tree (No. 466) yielded 254 plums, 

 weighing 6 pounds and i ounce. 



The difference in favor of spraying is thus about 5i 

 pounds in the weight of fruit. Or we may say the spray- 

 ing increased the yield about 48 per cent. 



