EPIZOOTIC LYMPHANGITIS 289 
sus). This affection has been recognized at different times in Japan, 
China and India. It has been known in Algiers for many years and 
during the war in South Africa it seems to have been introduced there. 
From South Africa it has been imported into England and Ireland by 
government horses returning from the Cape. The first case in 
England appears to have been detected in 1902. In 1907, Pearson 
discovered it in western Pennsylvania. Gasparini and, later, Ducloux 
in 1908 described the cryptococcus in every detail, as it has been 
observed by all writers on this subject, but avoided any discussion as 
to the possibility that the organisms belong to the yeasts, and they 
created, therefore, a new genus and species: Lymphosporidium equi 
(Gasparini) and Leucocytozoon piroplasmoides (Ducloux), respectively. 
Galli-Valerio in 1909 expressed the opinion that the cryptococcus has 
remarkable similarity to the Leishmanioses and he therefore Proposes 
the name of “Leishmania farciminosa”’ (Rivolta). 
Meyer, who studied this disease in South Africa and in the United 
States, concludes that the disease which was diagnosed as “epizodtic 
lymphangitis” in 1907 in Pennsylvania was sporotrichosis. “Epizo- 
otic lymphangitis” apparently does not exist in this country. Mor- 
phologically, by cultures and serum tests, the two diseases can easily 
be separated. In horses the parasite of sporotrichosis is very rare in 
the pus and can rarely be demonstrated microscopically. Page, 
Frothingham and Paige made a careful study of material from two 
cases in the Pennsylvania outbreak and found that the organism was 
a sporothrix which they cultivated in pure culture. They found it to 
be pathogenic for horses, mice and rats. 
Etiology. This disease is caused by an organism described by 
Rivolta as Saccharomyces farciminosus. It is also called a cryptococ- 
cus. According to Pallin, it is found in large numbers in the diseased 
tissues and products, partly free and partly enclosed in pus corpuscles, 
which often contain from ten to thirty or more of them. It is charac- 
terized by its clearly defined contour and its very refractile double 
outline. It measures from 3 to 4¥ in diameter, and in the unstained 
preparations it is said to be best seen with an oil immersion and Abbé 
condenser, under a magnification of not less than 800 diameters. In 
stained preparations it can be recognized with a much lower magnifi- 
cation. 
The classification of this organism has been much discussed by 
several workers. Canalis places it with the coccidia, Piana and Galli- 
