Parasites of the Circulatory System. 411 



rolled upon itself. The caseated nucleus may be more or less 

 calcified and the cretifaction may invade the fibrous walls of the 

 alveoli as well. 



Prevention. This may be attempted along the lines adopted 

 for other worms, the avoidance of water and fodder that have been 

 exposed to contamination, the boiling or salting of suspected 

 specimens, the use of water from deep, closed, cemented wells 

 only, and the constant access of the animal to salt are among the 

 desirable precautions. When su-spected food or water must be 

 used, such agents as quassia or areca nut may be given. 



Treatment. An important consideration is to restrain the ani- 

 mal from injuring himself by rubbing, biting, or scratching to 

 relieve the intense pruritus. Beside mechanical restraint, we 

 may resort to analgesics, the simplest of which is douching with 

 cold water from a hose for 15 minutes at a time, and repeated 

 several times a day. Carbolic acid (2:100); choral hydrate; 

 lead and opium lotion, or even cocaine may be applied. As local 

 vermicides, various agents are recommended. A covering of iodo- 

 form on the scraped surface covered with a layer of collodion, 

 and repeated daily has brought about a recovery in 15 days. 

 Ether, chloroform or tincture of iodine applied on cotton wool for 

 two minutes, and followed by collodion has done equally well. 

 Rey applied arsenic sulphide in imperceptible layer over the sore, 

 which removed pruritus and dried the wound into a scab, which 

 became detached in 8 days, leaving a healing surface. A cool 

 stall is in every case an important adjunct. 



OTHER FORMS OF DERMATITIS FROM LARV.ae OF NEMATODES. 



In various acute outbreaks of skin disease in the horse, nema- 

 tode larvae have been detected as a concurrent and evidently 

 causative condition. Though left in some uncertainty as to the 

 identity of the larvae in any given case they serve to show the 

 tendency of young worms to invade the solid tissues, and to de- 

 termine lesions in the integument. 



Pflug records the case of a horse with thick crusts around the 

 root of the tail, associated with intense itching, and under the 

 crusts he found numerous embryo or larval worms, which he be- 

 lieved to be the young of the oxyuris curvula, that were present 

 in large numbers in the colon and rectum. 



