Dourine 85 



fected with the far more common Geuital Horse Pox. In the 

 table on page 88 this animal is designated as No. XI. 



Some writers, in describing Dourine, accept the presence of de- 

 pigmented areas about the vulva and anus as conclusive evidence 

 of precedent ulceration, but depigmentation of the skin does not 

 necessarily follow vesicular or pustular eruptions nor does its 

 presence indicate that eruptions have occurred. We had excel- 

 lent opportunity for observing, day by day and week by week, 

 the depigmentation of the skin of the vulva and anus in Dourine 

 and saw it begin and gradually spread, without the presence of 

 any visible vesicles, papules or ulcers. It was a depigmentation 

 without ulceration. 



Fleming, (Veterinary Sanitary Science and Police); Williams, 

 (Principles and Practice of Veterinary Medicine); Law, (Veter- 

 inary Medicine); Moore, (Pathology and Diagnosis of Infectious 

 Diseases) and numerous other writers place emphasis upon the 

 presence of specific eruptions in Dourine, but fail to describe their 

 characters, and do not intimate that they have personally observed 

 them. The only definite assertion by any author, so far as we have 

 been able to find, that he has personally observed ulcers, papules 

 or vesicles is that of Thanhoffer, who records instances of mares 

 with eruptions about the perineum and inside the thighs and 

 presents illustrations of cases ; but there is nothing in their char- 

 acter of diagnostic value and it does not appear that the diag- 

 nosis in these cases was verified. 



In the extensive Illinois outbreak, which was under our per- 

 sonal charge, among more than 100 cases of the disease, not an 

 instance of eruptions was observed nor could the most diligent 

 inquiry among owners reveal any history of such in any animal. 

 In this outbreak, the cases were observed daily for some months, 

 and we were especially careful to search for these eruptions in 

 recent and old cases because, relying upon the descriptions of va- 

 rious writers, we expected to find them, and were disappointed 

 and confused when we did not. 



European writers are generally inexact in reference to vesicu- 

 lar and pustular eruptions and white spots upon the genital or- 

 gans. One of the first writers to point out the distinction be- 

 tween Dourine and the Genital Horse Pox and to assert that the 

 former was without eruptions, was Rodloff. Baldrey, after an 



