THE MONTHLY BULLETIN. 25 



The homemade lime-sulfur solutions are, so far as known, equal in 

 every respecl to the commercial except for the fact that it is imperative 

 tn tesl the gravity al leasl of the concentrate, in order to make a proper 

 dilution for use. Both the preparation of the concentrated solution and 

 its testing with a spindle or hydrometer arc comparatively simple opera- 

 tions and their feasibility is illustrated by the fact that this year more 

 homemade concentrate was produced by users than in recent years. 



PARIS GREEN, STEARATED. 



Water soluble arsenic (metallic) .30% 



Total metallic arsenic 27.38% 



Moisture 31.84% 



Copper soap 3.20% 



Total copper oxid in form of Paris green 19.85% 



Practically the mixture consisted of 



Commercial Paris green ■ 66.46% 



Moisture 30.34% 



ier soap 3.20% 



Copper soap as it occurs in the pasty material is not considered by 

 this laboratory as an injurious substance and if it does impart better 

 adhering qualities, as the makers claim, it may be a helpful ingredient. 

 In the purchase and use of the material it should be borne in mind that it 

 contains nearly one-third I o0.34 per cent) water and calculations should 

 be made accordingly. 



ROACH POWDER. 



I ionsisted of sodium fluoride and a powdered plant material, probably 

 pyrethrum. Both of these materials are of value. 



SOLUBLE SULFUR COMPOUND.' 

 A powdered material consisting of soda and sulfur in the following 

 forms: 



Total sulfur 57.09% 



The sulfur being in the following forms: 



Sulfur, free 1.33% 



Sulfur, as thiosulfates 18.19% 



Sulfur, as sulfates and sulfites 0.63% 



Sulfur, as sulfide 36.51% 



ATOMIC SULFUR. 



Total sulfur 48.69% 



Moisture 45.67% 



Ash 2.52% 



This pasty material is a convenient commercial preparation for the 

 application of finely divided sulfur. The activity depends on the free 

 sulfur present and other materials cause this sulfur to be easily sus- 

 pensible in the spray and to adhere well. 



._._.._ Sample Sample 



TIZIT. a B 



Sodium carbonate 16.64% 11.66% 



Soap 15.39% 11.59% 



sulfur 18.49% 19.71% 



Total arsenic (as As,.0 5 ) 4.77% 5.39% 



This complex material also evidently contains arsenic in the water 

 soluble I harmful) condition. From the chemical and physical examina- 

 tion the paste appears to be composed of lead arsenate, soap powder 

 and a sulfur paste. Mixtures of this type may be spoken of as "shot- 

 gun " sprays and appear periodically upon the market. 



'Analyzed by a method adapted from that for lime-sulfur solutions. 



