96 CAUSES AND PREVENTION OF DISEASE. 



into the hair along neck, back and rump, Persian insect powder, 

 or use solution No. 4, and blanket if stable is cold. A little 

 kerosene oil on a root, fiber or bristle brush, used frequently, 

 is safe and effective if used with reasonable caution. 



For poultry use whitewash in abundance, and plenty of 

 fine air-slaked lime dusted into the nests and on the floor. It 

 is a good plan to throw a handful at a time against the wall so 

 that it will float in the air and then gradually settle down into 

 crevices and over the poultry. Or spray kerosene over the walls 

 and ceiling and wash perches frequently with kerosene. This 

 is cheap, rapidly applied, and very effective. Give constant ac- 

 cess to dust bath of dust or sifted ashes, air-slaked lime, sulphur 

 and Persian insect powder. Keep poultry house dry. 



Other External Parasites. 



Ticks are effectually destroyed by oily preparations ; e. g., 

 No. 3 or 4 after shearing. 



Ring worm appears most 

 commonly on heads and necks of 

 cattle, especially calves ; but man 

 and all domestic animals are also 

 subject. It is caused by a vege- 

 table parasite. 



FIG. 36. HORSE BOX FLY AND -r , 1111 1 



LARVA. ^se scrubbmg brush, soap and 



Oastrophiius cqui. Larva in the warm water, then apply everv 



third stage. ' , ,•' 



Other day lo per cent, carbolic 



acid in glycerine, or tincture of iodine and tincture of iron, equal 



parts. 



INTERNAL PARASITES. 



The most common internal parasites are round worms, flat 

 worms and bots. 



Bots. — Medical treatment has not proven satisfactory. 



Nematodes {round 7i'oniis). — For the pin worms in horse, 

 empty the rectum by means of warm water injections and then 

 use warm rectal injections of astringent and bitter medicines, 

 like a very mild solution of copperas or a strong tea made of 

 quassia chips. Repeat once daily for two or three days, and 

 follow with an oily physic ; e. g., one quart of raw linseed oil. 



