PARASITOLOGY. 63 



ical in shape and composed of five articles each. 

 The free extremity of the last segment of each leg 

 is provided with an ambulacrum. (An ambulacrum 

 is a cup-shaped sucker attached to the extremity of 

 the leg by a pedicle.) The adult is provided with 

 four pair of legs ; the two anterior pair are located 

 on the anterior third, and point forward ; the two 

 posterior pair are located on the posterior half, and 

 point backward. 



Animals Infested. — They infest the air-sacs of fowls 

 and pheasants. They are white in color and can 

 be seen macroscopically as small bodies, very mi- 

 nute in size. They even reach the air cells of the 

 bones. 



Condition Produced. — Their irritation causes inflam- 

 mation and results in death of the host. 



TREATMENT OF SCABIES. 



Large bunches of cattle and sheep which become 

 infested with scab parasites must of necessity be 

 dipped. For this purpose the dip which has proved 

 the most successful is the lime and sulphur dip. 

 The lime acts as a solvent for the sulphur. The 

 sulphur is a parasiticide. This dip is made in the 

 following proportion : 



Unslaked lime 8 pounds. 



Sulphur 24 pounds. 



Water 100 gallons. 



Boil for two hours. Use at a temperature of 100 

 degrees to 110 degrees Fahr. Keep the animal in the 

 dip two or three minutes by the watch. Clean the 

 sheds or barns and yards. Disinfect the fences, 

 stalls, racks, and feed troughs with the sediment of 



