630 Veterinary Medicine. 



congested, virtually gorged with blood, enlarged and yellow or 

 yellowish brown. The spleen is greatly enlarged, blood gorged, 

 and shows irregular, rounded swellings indicating the seats of 

 extravasation of blood. In some instances rupture has taken 

 place. The kidneys are congested, enlarged, softened and of a 

 brownish red or black color, with circumscribed extravasations 

 especially in the cortical area. The lungs are violently congested ,. 

 with many areas of blood extravasation, and they do not collapse 

 when the chest is opened. The bronchia are filled with a white 

 froth. The heart is petechiated, with a parboiled aspect and 

 shows areas of commencing necrosis or fatty degeneration. 



In the chronic form the watery condition of the blood is remark- 

 able, the serous cavities (peritoneum, pleurae, pericardium, arach- 

 noid) contain considerable effusion, dropsical conditions of the 

 neck, head, limbs and dependent parts of the body are common,, 

 the lungs show hepatization and minute centres of suppuration, 

 and other viscera may show fibroid degeneration. 



Prevention. It is advisable to keep susceptible horses from the 

 low marshy and tick-infested lands from June to November and 

 to avoid especially water that is drawn from such lands. It is 

 not needful to take the stock to any very marked elevation pro^ 

 vided the land is dry and free from wet or swampy areas and 

 ticks. The native horses or those that have been long in the 

 marshy district and have thus secured a partial immunity may 

 profitably replace the more recently imported and susceptible 

 horses during the dangerous summer months. 



Edington by injecting, intravenously, the blood of an immune 

 horse or preferably ass, produced in 27 out of 50 the character- 

 istic fever, and on recovery they proved immune. A 2nd in- 

 oculation produced the reaction in cases where the ist failed. 

 This is inapplicable to horses already affected (even recovered — 

 salted — horses), and those under treatment should be sheltered 

 from the summer sun. Any intercurrent disease like horse 

 sickness should also forbid immunization, as either or both may 

 be aggravated. 



To destroy ticks use similar measures to those advised for 

 Texas fever. 



Treatment. Pierre employed quinia sulphate or bromide 45 grs. 

 in distilled water i oz., intravenously, Gelston, creolin, subcutem^ 



