180 The Effect of Various Chemicals on Bloio-Fly 



TABLE VII. 



Emulsions. 



Reagent 

 Creosote 

 Turpentine 

 Methyl Salicylate . 

 Crude Pyridine 

 Safrol 

 Indol 



Preparation containing Green Oil and Pyridine 

 Preparation containing Sulphides of carbon and potash 

 Preparation containing /3-Naphthol 

 Preparation containing Green Oil 

 Preparation containing Resin Oil 



Preparation containing /3-Naphthol and Potassium Sulphid 

 Preparation containing /3-Naphthol and Sulphur . . 

 Preparation containing Potassium Sulphide . . 



(c) Vapour experiments. 



In these experiments a large number of larvae were placed in a 

 wide glass tube, about \\ ins. in diameter and 9 ins. long, one end of 

 which was attached to an aspirator and the other to a "U" tube 

 containing the material to be tested ; so that the air which was drawn 

 over the larvae by the aspirator became saturated with vapour in the 

 "U" tube. The larvae were subjected to this treatment for 3\ hours; 

 then they were placed in sawdust in jars. 



The controls were placed in tubes through which pure air was 

 drawn in the same manner. 



