4^6 MANUAL OF BACTERIOLOGY. 



occidentalis, both male and female. He also found that one 

 attack affords a high degree of immunity. The virus is 

 not filterable through a Berkefeld filter. The parasite, 

 whatever it may be, is found in the body fluids generally. 

 The infectiousness of the blood is largely destroyed by grinding 

 the infectious blood in a ball-mill. 



Certain peculiar bodies suggestive of parasites have been 

 found in the lesions of a tropical disease known as "Delhi 

 Boil.'' Wright* gives in substance the following description 

 of the disease and the bodies alluded to. The disease resem- 

 bles some of the manifestations of syphilis and tuberculosis, 

 and is held to be infectious. It consists of multiple nodules 

 in the skin which finally ulcerate. It lasts for months or for a 

 year or longer. In smear preparations made from material 

 obtained from one of the lesions, fixed in methyl alcohol, and 

 stained by Wright's modification of the Romanowsky a large 

 number of the bodies first described by Cunningham and 

 believed by him to be living parasites were observed. They 

 were for the most part round, though other forms were also 

 "present, and from 2 to 4 mikrons in diameter. Most of the 

 periphery was robin's egg blue, the center was unstained. 

 Each of the bodies showed a larger and a smaller lilac-colored 

 mass. Sections of the same material showed the same bodies. 

 The evidence adduced as to the parasitic nature of the bodies 

 is insufficient to show that they are not the products of cell 

 degeneration. Animal experiments were negative. 



*Journ. Med. Research. Vol. X., 1904. pp. 472-482. 



