76 REPOBT ON DOTTRINE. 



the ' Pyroplasma bigemmum' had made its appearance spontaneously 

 in plains cattle at the Bareilly Laboratory, some days after 

 being subcutaneously inoculated with virulent rinderpest blood 

 derived from Hill bulls at Muktesar, elevation 7, #00 feet above sea 

 level. Of the two animals primarily affected with the above-men- 

 tioned disease, one was brought from near the Ramganga river and 

 the second from a district bordering on the Jumna. Both animals 

 had been inoculated with rinderpest, one six weeks later than the 

 other, but in'both instances the symptoms of the second followed 

 before those of the primary disease had disappeared from the 

 affected animals, and on microscopical examination of their blood 

 60 and 62 per cent, respectively of the red blood corpuscles were 

 found to contain the organism of the disease. The control rinder- 

 pest blood utilized for inoculation purposes was found to be free 

 from the ' materies morbi ' of: Texas Fever, and no other cattle out 

 of some 90 inoculated showed symptoms of the latter malady, FO 

 that it was not contracted at the Bareilly Depot from the infected 

 rinderpest blood. It would therefore appear that the ' Pyroplasma 

 bigeminum ' is able to lie dormant in the systems of some of the 

 plains cattle of this province, until such time as the restraining 

 power present in the blood has been modified or removed, when it 

 again assumes an active state and the reduction or entire removal 

 of the hereditary or acquired resistance to the organism may in 

 some cases be materially hastened by such animal passing through 

 an attack of (inoculated) rinderpest. Ticks (ixodes) more .or less 

 replete with blood picked of the bodies of the affected bovines are 

 capable of transmitting the disease, and young ticks hatched out 

 from the eggs, many weeks later, are also able to communicate the 

 disease when they attach themselves to susceptible animals. 



(b) Pyroplasma tropica.-*- Whether the years 1908-04 were 

 exceptional ones in the plains of India I am not as yet in a posi- 

 tion to say, but all animals which have come under observation, of 

 whatever species, with the exception of bovines and buffaloes 

 received from the Himalayan regions at Muktesar, have without 

 exception respectively exhibited pyroplasmata in their red cor- 

 puscles and free in the blood plasma. Further, all Himalayan 

 animals, bovines and buffaloes, after coming across the Bhabar and 



