8o MAINE^ AGRICULTURAL EXPERIMENT STATION. I9IO. 



Acid Carbolic, Crude, per gallon 25c. 



Acid Carbolic, Crude 50-60 per cent., per gallon 40c. 

 Acid Carbolic, Crude 90-95 per cent., per gallon 50c. 



To get the proper results only the po-p^ per cent, should he 

 used for making lice pozvder. The weaker acids are ineffective. 



Owing to the difficulty in getting the strong crude carbolic 

 acid locally in this State at reasonable prices,* the Station 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 j parts of gasoline, and 



I part of crude carbolic acid, po-p^ per cent, strength, 

 cr, if the po-pj per cent, strength crude carbolic acid canv.ot he 

 obtained take 



J parts of gasoline and 



I 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 i quart of 

 the liquid. The exact amount, however, must be determined 

 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 plas- 

 ter. When enough plaster has been added the resulting mix- 

 ture should be a dry, pinkish brown powder 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 



*One report has come to the Station of a farmer being charged $1.00 

 a quart for the poorest grade of crude carbolic acid for which a rather 

 high retail price is 25 cents a gallon as shown above ! It may be said 

 that the Station has been able to obtain carbolic acid of the grade 

 desired from Mr. C. F. Nichols, Orono, Maine. Mr. Nichols is pre- 

 pared to furnish the 90-95 per cent, crude carbolic to anyone at a price 

 in reasonable accordance with that given above, making allowance for 

 the cost of containers, packing, etc. 



