212 Diseases of Poultry 



" Take 3 parts of gasoline, 



1 yart of crude carbolic acid; 



"To get the proper results only the 90-95 per cent car- 

 bolic acid should be used for making lice powder. Weaker acids 

 are ineffective. 



"Owing to the difficulty in getting the strong crude car- 

 bolic acid locally in this State at reasonable prices, the Sta- 

 tion has experimented to see whether some other more readily 

 obtainable substance could not be substituted for it. It has 

 been found that cresol gives as good results as the highest 

 grade crude carbolic. 



" The directions for making the powder are now, therefore, 

 modified as follows : 



"Take 3 parts of gasoline, and 



1 part of crude carbolic acid, 90-95 per cent strength, 

 or, if the 90-95 per cent strength crude carbolic acid cannot be 

 obtained take 



3 parts of gasoline and 

 1 part of cresol. 



" Mix these together and add gradually with stirring, enough 

 plaster of paris to take up all the moisture. As a general 

 rule it will take about 4 quarts of plaster of paris to 1 quart 

 of the liquid. The exact amount, however, must be deter- 

 mined by the condition of the powder in each case. The 

 liquid and dry plaster should be thoroughly mixed and 

 stirred so that the liquid will be uniformly distributed through 

 the mass of plaster. When enough plaster has been added 

 the resulting mixture should be a dry, pinkish brown pow- 

 der having a fairly strong carbolic odor and a rather less 

 pronounced gasoline odor. 



"Do not use more plaster in mixing than is necessary to 

 blot up the liquid. This powder is to be worked into the 

 feathers of the birds affected with vermin. The bulk of the 

 application should be in the fluff around the vent and on 



