342 
Piroplasma bonis 
the living parasite under the microscope. The letters A to G denote as 
many different parasites. Thus, parasite A is represented by six figures, 
the numbers 12, 22, 34, etc. beneath the figures denote the minutes 
that had elapsed from the time the blood was drawn to the time when 
the particular sketch was made. The time was recorded by means of 
a stop-watch, which was started at the moment when the sample of 
blood was taken from the animal’s ear-vein. 
Figures A to D represents the process of division as observed in four 
different parasites. Parasites A, B (and G) were observed at 41° C. in 
one preparation and in the same field. The blood was derived from 
Cow I (this vol. p. 252) on the 5th day after inoculation. The cow was 
immediately afterwards treated with trypanblue and recovered. At the 
time the blood-sample was taken, - 8 °/ 0 of the red blood corpuscles 
harboured parasites, and 4°/o°f these were represented by dividing 
forms. The presence of so many parasitized corpuscles in one field 
