REPORT ON DOUUINB. 



be but a few hours (12 to 18), or more prolonged and pass off 

 within a period of three weeks, leaving white patches (leucoderma) 

 i>u the tissues of the external genital organs. It is almost impos- 

 sible to diagnose the presence of Dourine during the persistence of 

 the acute symptoms, although a shrewd suspicion may be entertained. 

 Our experience points to the fact that the trypanosoma does not 

 develop in the muco-purulent discharge ; but when this has ceased, 

 it may in some cases be found within a few hours, in the vaginal 

 mucus, unmixed with blood. Should leucoderma of the external 

 genitals, especially in mares, present itself during the first three 

 weeks of the development of symptoms, this will probably point 

 to the fact that the tissue changes have been caused by Vesicular 

 Exanthema, but in nowise can this disprove the presence of 

 Dourine also, as the primary symptoms of the former disease may 

 only have masked the symptoms of Dourine, if any were exhibited, 

 and the latter disease may appear later in due course. In tbe 

 following table will be found the essential points of similarity and 

 the reverse in the cases of Surra and Dourine : 



TABLE VII. 



The differential diagnosis of Surra and Dourine in equities in 



India. 



Symptoms. 



Surra. 



Dourino. 



Period of incubation, 

 Spontaneous . 



Inoculated 



Paroxysms anil In- 

 termissions. 



When conveyed by flies d 

 to 8 days. 



Paroxysmal blood from 



general circulation 4 to 



6 days. 

 Intermission blood from 



sreneral circulation, 8 to 



10 days. 



Course of disease sharply 

 defined into paroxysms 

 and intermissions by pre- 

 sence and absence of ma- 

 ture trjpanosoma in the 

 blood. 



Stallions 16th to 29th day. 

 Mares from 10th to 49th 

 day. 



General circulation blood 

 13 to 18 days. 



Plaqne blood 12th 

 13th day. 



or 



Paroxysms and intermis- 

 sions, sometimes sharply 

 defined. 



