18 



destroy insect pests. Both of these remedies are best applied in 

 water, and as the expense of application must be reduced to the 

 minimum the use of the two remedies combined seemed advisable. 

 For this reason a series of experiments was undertaken to test the 

 value of the various forms of copper solutions combined with Paris 

 green (London purple having been found more injurious to the foliage 

 of plants than Paris green, and white arsenic being thought too dan- 

 gerous on account of its inconspicuousness.) 



EXPERIMENT NO. I. 



AMMONIACAL CARBONATE OF COPPER AND PARIS GREEN. 



Formula: — 3 oz. precipitated carbonate of copper dissolved in 1 qt. aqua 

 ammonia (22° Baume) diluted with 28 gallons of water and one pound of 

 Paris green to 500 gallons of the mixture. 



The following diagram will illustrate the arrangement of tlie plots : 



DIAGKAM OF PLOTS. 



I o Anjon 



^"^^ ^\ oBartlett 

 I o Clapp's 

 I 



! o R. I. Gi 



No. 1-1 



o Baldwin 



\1. 



I o Anjou 

 J o Anjou 

 No. 2-] o Barilett 

 I o Clapp's 



I 



o R. I. Greening 



No. 2-] 



I o Baldwin 



No. 3- 



o Anjou 



o Anjou 



o Bartlett 



j o Clapp's 



I o R. I. Greeninc 



No. 3-1 



I o Baldwin 



No. 



I 



I o Anjou 

 4 I o Anjou 

 ! o Bartlett 



L°J 



Clapp's 



No. 5- 



o Anjou 

 o Anjon 

 o Bartlett 

 o Clapp's 

 I 



No. 4- 



No. 5- 



o R. I. Greening 

 o Baldwin 



o R. I. Greening 

 j o Baldwin 



I [Small, no fruit.] 



