Trichorrhexis Nodosa. 537 



of soap in washing as conducive causes. Debility and impaired 

 nutrition of the hair may operate in the same way. No specific 

 microbe has been constantly found in these cases and until such 

 factor can be proved, it may be held that among the etiological 

 agents impaired nutrition and dry air are important. 



In the way of treatment shaving of the affected parts and oily 

 or vaseline applications may be tried, together with such slight 

 cutaneous stimulants as petroleum, weak tincture of cantharides, 

 sulphur, tar ointment, etc. Roy noticed that cases that had 

 lasted all winter recovered after shedding of the coat. It might 

 be assumed that the evulsion of the infected hair, and the vascular 

 stimulus necessary to the new growth contributed to the result. 



