24 



THE MONTHLY BULLETIN. 



To obtain 1.21 pounds of copper oxid in 50 gallons of spray it would 



be necessary to use this at the rate of 9.80 pounds to every 50 gallons of 



water. 



CRUDE CARBOLIC ACID. 



Sample T ° taI Phenols. 



A i 6.51% 



B .;_______-____— _--__- 1-73% 



n 16.96% 



D _._ 17.45% 



These results show well the variation in the crude carbolic acids found 

 on the market at the present time. The only way in which a user can 

 determine the quality of this class of materials is by having a chemical 

 analysis made. 



CHLORIDE OF LIME. 

 Sample Available chlorine 



A 21.54% 



B . _. 20.70% 



C— — I 33.79% 



Samples A and B were commercial brands. Sample A was taken 

 from a new can and B taken from a can from which a portion had been 

 removed a year previous, the can having been tightly closed while not 

 in use. Sample C is "chemically pure" material for laboratory pur- 

 poses and the available chlorine was determined in it for comparative 

 purposes. 



FORMALDEHYDE FUMIGATOR. 



Weight of product contained (paraform) 42.3 grams 



The product contained formaldehyde 72.67% 



GUM CINCH. 



This material is a black viscous liquid having an empyreumatic odor. 



It was determined to be essentially pine tar, or pix liquida of the U. S. 



Pharmacopoeia. 



INSECT EXTERMINATOR. 



Specific gravity 0.S447 



Nitrobenzol 12.87% 



A solution of nitrobenzol in kerosene. 



LEAD ARSENATE, DRY POWDERED. 



Moisture 0.57% 



Total arsenic (ASoO.,) 3 £-» 5 2° 



Water soluble arsenic (As^Oc) 0.35% 



Calculating from the moisture content it is necessary to use only one- 

 half the amount of this dry powder as of lead arsenate paste containing 

 50 per cent of water to obtain sprays of the same strength. 



LIME-SULFUR SOLUTIONS. 



