336 
Parasite of East Coast Fever 
we kept apparently dividing forms under observation with doubtful 
results; the observation only ended when the corpuscles became 
crenated or the parasites faded away after the corpuscle had vanished. 
At times the stems of the pears and the two swollen portions appeared 
to be connected by a delicate web of protoplasm; at other times, when 
rotated, the parasite appeared like an 8 (compare C 102', 131', 217'). 
On the other hand, hour glass or 8-forms and bacilliform parasites have 
repeatedly been observed to persist unchanged for hours. Similar 
observations were made on corpuscles containing what appeared to be 
2, 4, 5, 8 parasites. (Diagram 4.) 
79 102 131 217 265 372 
21 24 29 30 35 62 
Diagram 3. 
Fig. A. Illustrates the changes of form of bacilliform parasites, the first observed during 
the period 47'—66', the second during the period 48'—67'. The corpuscles vanished 
in both cases at the end of the observation and the parasites broke up rapidly into 
bead-like particles which ultimately disappeared. Observation at 42° C.; 6. hi. 09. 
(G. H. F. N.) 
Fig. B. Illustrates the apparent division of a parasite into two. Observation at 38° C.; 
3. m. 09. (A. P.) 
Fig. C. Illustrates the apparent division of a parasite into two, but when the corpuscle 
vanished (372') but one parasite (and a fragment?) was left which then degenerated. 
Observation at 37° C.; 4. in. 09. (G. H. F. N. and H. B. F.) 
Fig. D. Selected figures from a series, illustrating the movements of two parasites within 
a corpuscle and the escape (62') of one of the parasites from the corpuscle which 
remained uninjured and retained the other parasite. Observation at 10—12-5° C.; 
28. n. 09. (G. H. F. N. and H. B. F.) 
Growth: In several instances two observers agreed that the parasite 
bad increased slightly in size in the course of 1 to 2 hours. It was also 
