1C8 DISEASES OF THE CIRCULATORY APPARATUS 



exist in great numbers and none of these symptoms be present — uncon- 

 sciousness, cl3^spnoea, and rabiform symptoms. How the parasites find 

 their way into the blood is rather interesting. The embryo is passed in the 

 urine and carried by air or water into rice fiekls or swampy places, and 

 the parasite finds its way into the system through the dog drinking the 

 water. Some authors contend that the larvae get into the blood as the 

 larvse of the Filaria sanguinis of man by being first absorbed by the mos- 

 quito and then developed and passed again to the dog. 



Frohner tried to reinoculate a dog intravenously with blood con- 

 taining the embryo, but with negative results. 



As to prophylactic or therapeutic measures, nothing has as yet been 

 found to answer the purpose. In regions where the parasites exist, the 

 administration of boiled or filtered water could be carried out only in the 

 case of household pets; diuretics tend to wash the parasites from the 

 kidneys. Frohner says that in Japan, where the parasite is prevalent, ar- 

 senic is used with advantage. 



Hsematozoon Lewisi. — These parasites are very small, resembling 

 Filaria immitis found in India, China, Italy, and France. Grassi thinks 

 the larvse develop in the fleas and lice that infest the dog. 



Strongylus Vasorum (Haematozoon Subulatum). — These exist in 

 France and in certain parts of Italy. Leisering found them in the blood, 

 lungs, prostate, and the spongy portion of the penis. He considers 

 Ha?matozoon subulatum to be identical with Strongylus vasorum or 

 one simply to have taken a different form. These parasites produce 

 anaemia, gradual emaciation, irregularity of the heart's action, and 

 cough. 



Spiroptera Sanguinolenta (Filaria Sanguinolenta) . — This parasite 

 has already been described on page 51. In its larval form it is found 

 forming aneurysms which burst and form hemorrhages into the pericard- 

 ium, or entering the pulmonary circulation incomplete are carried into 

 the lungs. 



