HOUSEHOLD AND CAMP INSECTS 79 



lines means that horses will enjoy comparative immunity from these 

 pests. 



Lice. Horses occasionally become infested with these parasites, 

 and the use of any one of the following preparations has been 

 advised : 6 



1 Gray mercury ointment, not more than 150 grains at each 

 application, may be rubbed in, either alone or mixed with oil or 

 soft soap. It must 'be brushed over the whole body, care being 

 taken near the eyes. 



2 An infusion of tobacco (i to 25 or 30) with or without addi- 

 tion of vinegar; this is poisonous. 



3 A mixture of i part petroleum to 10 of methylated spirit, or 

 equal parts of petroleum and rape seed oil. 



4 A 2 to 3 per cent solution of creolin in water, or a 3 per cent 

 solution of liquid kresoli saponatus; both of these solutions must 

 be brushed in. 



5 Sabadilla vinegar i to 20. This is poisonous and should be 

 well rubbed in at strongly infested spots only. 



6 Fish oil may be used in the same way as 5. 



7 In case of need the horse may be washed with soap and 

 water, and while the coat is still damp, finely sifted beech ashes 

 may be dusted on and well brushed in. To prevent eggs hatching, 

 infested spots should be repeatedly washed with vinegar. 



Lice on chickens may be destroyed 'by the use of sodium fluoride, 7 

 pinches of the insecticide being distributed among the feathers 

 next the skin; one on the head, one on the neck, two on the back, 

 one on the breast, one below the vent, one on the tail, one on either 

 thigh, and one scattered on the under side of each wing. This dust 

 is somewhat irritating to the nose and throat, and if allowed to 

 remain on the skin in any quantity for a great length of time, may 

 cause slight local irritation. 



Or sodium fluoride may be dissolved in tepid water at the rate 

 of three-quarters to i ounce commercial powder, or two-thirds of 

 an ounce of the chemically pure material to each gallon, and the 

 fowl being held by the wings, quickly submerged in the solution, 

 keeping the head out while the feathers are ruffled with the other 

 hand to allow the dip to penetrate to the skin. The head then 

 should be dipped once or twice and the bird elevated and allowed 

 to drain a few seconds. 



6 Rev. Appl. Ent, 4:10. 1916. 



7 Farmer's Bui., U. S. Dep't Agr., May, 1917, p. 23. 



