EXPEKIMENTS AGAINST CHICKEN LICE AND DOG FLEA. 3 



in lime-sulphur concentrate (33° Baume), diluted 1 part to 14 parts 

 of water, were completely freed from lice. 



The use of these mixtures can not be highly recommended for the 

 following reasons: Too heavy an application may kill or seriously 

 injure the treated birds; the plumage is left in a soiled and dirty 

 condition and the oils retained on the feathers may have an injurious 

 effect on the eggs in the case of sitting hens. Unless the dipping 

 or spraying is done on a warm, clear day there is danger that the 

 fowls may become chilled. 



OIL PREPARATIONS USED AS FUMIGANTS. 



Table I shows the results of tests with oil mixtures used as fumi- 

 gants against chicken lice. 



Table I. — Results of tests with oil preparations used as fumigants against chicken lice. 

 Two or more fowls confined in a sprayed or painted box for each test. 



Test 

 No. 



Active ingredients. 



Treatment. 



Exposure 



Per cent 

 killed. 



Neutral coal-tar oil 



Coal-tar distillate, ammonia 



Phenols, coal-tar hydrocarbon oils. 



Coal-tar oils, phenols 



Coal-tar creosote oil 



Goal-tar distillate 



Interior of box painted. 



....do 



Bottom of box painted. 



....do 



Interior of box painted. 

 ....do 



Phenols, light oil from coal tar 



Neutral tar oils, phenols, pyridine 



Creosote oil 



Kerosene oil, pine oil 



Coal-tar light oil 



Coal-tar oils, phenols 



Coal-tar oil, naphthalene, anthracene. 



Neutral coal-tar oil 



Coal-tar distillate 



Creosote oil, mineral oil 



Coal-tar distillate 



Creosote oil, anthracene 



Benzol, tar acids, naphthalene 



Coal-tar oils 



Coal-tar emulsion 



.do. 

 .do. 

 .do. 

 .do. 



Bottom of box painted. 

 ....do 



.do. 



Interior of box paiated. 



do 



do 



do 



do 



do 



do 



do.2 



Minutes. 



5 



10 



10 



15 



30 



30 



Hours. 



1 



1 



1 



1 



1 



1 



1 



2 



2 



2 



2 



2 



2 



3 



3 







100 











100 



100 



100 

 100 

 100 

 100 

 100 

 100 

 75 

 100 

 95-100 

 95-100 

 98-100 

 100 

 100 

 100 

 100 



i An active ingredient is one that is effective against chicken lice when used at a proper dilution. 

 2 Diluted 1 to 25. 



This table shows that almost all of these preparations were very 

 effective against lice when the fumigation was continued for not 

 less than 30 minutes. If only the bottom of the box was treated, 

 an exposure of 10 or 15 minutes failed to kill any lice but when the 

 whole interior of the box was painted or sprayed a fumigation of 

 10 minutes was effective. An exposure of 5 minutes under the 

 f latter conditions was of no value. 



Although effective, this method of treatment can not be recom- 

 mended because of the injurious effect on the fowls. While no 

 chickens were actually killed in these tests they were all more or 

 less affected by the treatment as was shown by their very laborious 



