THE SWAMP FEVER OF HORSES. 
those which have been described by Mott in the organs 
of Dourine-infected animals. It is believed that in our 
preparations these bodies are merely the products of degen- 
erated cells or of cells destroyed in the making of the 
smears. 
These bodies measure from two to five microns in diam- 
eter. They are usually round or oval in shape. They con- 
sist of a dense area and of a matrix enclosing it. The 
denser area us.ually occupies about one-fourth of the whole 
area of the body and consists of a single granule, although 
occasionally there may be two. These areas stain very 
deeply with the color taken by chromatin. The matrix 
usually takes a pinkish color; occasionally it is stained a 
bright blue. 
Such bodies are usually found lying free in the organ 
smears. Occasionally they seem to lie within mononuclear 
white cells ; frequently appearances are seen which make it 
very evident that these bodies are formed by the fragmenta- 
tion of the nuclei of cells. 
The late Dr. Ballah, while he was attached to the Pathological Labora- 
tory at McGill University, and later to the Government Laboratories at 
Regina, did much work on Swamp Fever. Some of his results were pub- 
lished before his death ; 2" he described the disease, his attempts to 
transmit it by inoculation and the appearances seen at autopsies and of 
animals dead from it. He also described bodies which he found in the 
livers. 
Case IV. (Dr. Ballah). — Post-mortem changes are marked. Lung: 
Normal. Spleen : Moderately congested. There is much dark brown 
crystalline pigment in the pulp. Liver: Moderately congested. There 
are many focal necroses, similar to those described in the Black Gelding 
(see above), though the central necroses are not so abundant. The 
sinusoids contain many mononuclear cells, some of which are phagocytic. 
Others are lymphocytes, the remainder are probably endothelial in origin. 
The necroses contain large numbers of phagocytic cells and relatively few 
polymorphonuclear leucocytes. The liver cells adjacent to the necroses 
show degenerative changes, evidenced by pale staining vacuolation and, 
occasionally, invasion by leucocytes. There are groups of liver cells 
about the necroses which are filled with minute eosin-staining rings one to 
two microns in diameter ; some of these rings contain central, or eccentric, 
eosin-stained dots. These bodies stand out more strikingly in sections 
