June, 1917.] ARSENICAL RESIDUES AFTER SPRAYING. 11 



Table No. 3. Summary of Residues on Apples (III). 



Results of Analyses of Fruit from Trees Shown in Tables Nos. t 



and 2. 



Tree 

 No. 



Amount 

 fruit. 



Residue per 

 apple (AS2O3). 



Fruit Picked Carefully. 



1 



2 

 4 

 7 



.0027 gms. 

 .0598 gms. 

 .0192 gms. 

 .0148 gms. 



. 1 1 mgms. 

 .37 mgms. 

 .77 mgms. 

 .08 mgms. 



Fruit Picked in Ordinary Manner. 



Fruit Handled with Cotton Gloves. 



Fruit Handled with Cotton Gloves and Wiped. 



1 



4 



.0153 gms. 

 .0425 gms. 



. 08 mgms. 

 . 18 mgms. 



* These 25 apples were selected as showing maximum residue adhering. 



Picking of fruit from early varieties began August 5, with the 

 Early Harvest, 3 days after these trees had been sprayed. No 

 rain had intervened. Other lots of fruit were picked from 

 sprayed trees at various times up to October 28, 90 days after the 

 spray had been applied. 



