334 



later stages of the disease, but especially in the 

 kidneys. 



Post-mortem. — Haemorrhagic oedema about 

 the stomach, kidneys, and retroperitoneal tissue. 

 Intense hyperaemia of the spleen and kidneys, the 

 latter are nearly black. Haemorrhagic erosions. 

 Ulcers in various portions of the alimentary canal. 

 Ecchymoses in pelvis of kidney. 



Fig. 74. Piroplasma canis (left), typical Piriform 

 Parasites ; {right) Amoeboid forms 



Transmission by Ticks. — According to Motas 

 (Bucharest), Piroplasma ovis can be transmitted by 

 transferring adult ticks from an infected to a non- 

 infected animal. He did not succeed in trans- 

 mitting the disease by larvae or nymph ae de- 

 veloped from ticks taken from infected animals. 

 This is in direct opposition to the classical re- 

 searches of Smith and Kilborne on Piroplasma 

 bovis, corroborated by Koch. Sm-ith and Kilborne 

 hatched young ticks from the eggs of ticks that 

 dropped off infected cattle. It is these young ticks 

 that communicate the disease. 



2. Piroplasma canis. — The parasite is mor- 

 phologically identical vi^ith Piroplasma bovis. It 

 is a strictly specific parasite, and has not been 

 transferred to any other animal than the dog. 

 Native dogs in the tropics may harbour the para- 

 site without shewing any symptoms. 



