288 Veterinary Medicine. 



ing vitality, but as drying is usually fatal to them, Stiles considers 

 this as highly improbable. 



Taken into the stomach of a suitable host, the young worm re- 

 sumes its feeding which had beeu interrupted during the last 

 stage. It grows to about .66 mm. by 25 jn, its mouth turns 

 slightly dorsad, and two pairs of teeth, dorsal and ventral, appear. 

 Buccal capsule and digestive system become better developed, 

 and the male and female sexual organs begin to form in different 

 individuals. About fourteen days after they have entered the in- 

 testine, having attained about 2 mm. long by 12 to 14 fi. broad, 

 they pass through the last moulting and assume the characters 

 though not yet the size of the mature worm. 



Sources of Infection. These are infested jBelds and waters. 

 Pastures that have been grazed year after year by sheep harbor- 

 ing this worm, feeding yards where the surface and troughs are 

 contaminated by the sheep droppings and young worms, pools, 

 streams or open wells into which these have found their way, 

 streams that have flowed through infested pastures higher up, 

 fields that receive the drainage of higher infested pastures during 

 wet weather, swamps and springy places that preserve and develop 

 the parasite out of the body and in which the vegetation is easily 

 torn up by the roots with infested mud adherent, feeding salt or 

 meal from the bare ground to be licked by the sheep, soiling on 

 cultivated fodders in wet weather, salt or alkaline licks including 

 dried up liquid manure, all tend to the introduction of the para- 

 site into the system. 



Symptoms. Beyond unthriftiness, loss of condition, loss of the 

 sub-cutaneous fat, weak flaccid muscles, uncertain swaying gait, 

 blanched mucosae, and anaemia, little has been noted as the result 

 of sheep uncinariasis. It cannot be doubted, however, that the 

 long list of evils, which attend on infestmeut by hookworms in 

 man could be noted also in different cases in the sheep. The 

 alternate constipations and diarrhoeas, the cardiac palpitations and 

 anaemic murmurs, the intermaxillary subventral, pleural and 

 peritoneal dropsies Which attend on other sheep parasitisms, may 

 well be looked for in different cases The discovery of the worms 

 and especially of their transparent eggs by washing the fasces 

 must after all be looked upon as the conclusive evidence (see 

 under U. Radiata). That the worm sometimes exists without 



