166 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 7 



From these figures it is clearly seen that the plots sprayed with 

 acid arsenate of lead lost more of the unclassified peaches than did 

 those where a neutral product was used, although on the neutral 

 plots more units of AS2O5 were used. 



In the next table is given the relative shedding on three plots 

 sprayed with 1 pound of basic, neutral and acid arsenates of lead. 



TABLE VI 



From this comparison it is quite clear that there is no direct ratio 

 between the units of AS2O5 and the percentage shed. This is further 

 evident by the following: 



From the four tables given in this section of the paper, the following 

 facts are indicated: 



1. That when used in accordance with the spraying practices of the 

 present day, all trees sprayed with the different forms of arsenate of 

 lead used in these experiments, shed a comparatively large number 

 of fruits showing no insect injury. 



Constant characteristics of these fruits are that the stems remain 

 on the tree and the fruits show a slight shriveling at the base. 



2. That the number of these shed fruits varies with the form of 

 arsenate of lead used and that the acid forms causes the greater per- 

 centage of loss. 



3. That this shedding does not vary directly with the units of 

 AS2O5 used, but apparently depend more on the form of arsenate of 

 lead. 



Mr. J. A. Dew: I wish to say that the suggestions in this paper 

 are not conclusions, but some points came up while the work was being 

 conducted and I thought it might be interesting to the members of 

 the Association to bring them forward at this time. The work was 



