FLAGELLATED ORGANISMS IN THE BLOOD OF ANIMALS. 361 



about 9 a.m. on the 26th October, it was found to contain a con- 

 siderable number of these organisms in a state of great activity. 



Tig. 1. — Vanuua appearances presented by flagellated organisms in blood from 

 a puppy's ear, seven to eight hours alter it had been under the cover- 

 glass : at a after eleven hours, b, c, d, changes undergone by a proto- 

 plasmic body in the field during the course of a few minutes. Two blood- 

 corpuscles introduced to indicate the relative size, x 1000 diameters. 



Their movements were so rapid that it was impossible to obtain 

 a clear conception of their exact form. The slide was set 

 aside and again examined at 4 p.m., when it was found that 

 their movements were much more languid and less suggestive 

 of spirilla than they were in the morning. It was at this time 

 that the figures above reproduced were sketched. As the 

 rapidity of the movements diminished there appeared to be a 

 greater tendency to throw out flagellje, and wave-like extensions 

 of their substance seemed to originate at the thicker end and 

 to pass along rapidly towards the flagellum. The plasma- 

 substance appeared to be contractile along the whole length of 

 the parasite, even to the very tip of the flagellum, and, fre- 

 quently, an impression was conveyed, suggestive of the organism 

 being flat or ribbon-like; consequently, when seen in profile 

 they presented a much more attenuated aspect than under 

 other conditions. Moreover, it is difficult to decide how much 

 of the wave-like appearance above referred to is due to rapid 



