C)}^. H. F. Nuttall and C. Strickland 
B9 
(1) Small parasites (Diagram I) measuring about 1 to 1‘4 fjb in 
size are frequently observed to be amoeboid. They move about within 
the corpuscle in an irregular manner whilst altering their shape, being 
at different times either oval, rounded, or piriform; or they may 
protrude a slight bud-like process. Some of this alteration of form 
is attributable to the rotation of the para.sites within the corpuscle. 
The parasite may occasionally protrude a long filiform process, more 
rarely do they protrude two bud-like or filiform processes. These 
processes may be protruded or retracted slowly or within a couple 
of minutes. In some cases a rounded parasite was seen to protrude a 
long straight or curved filiform process extending two-thirds across the 
width of a corpuscle, the parasite undergoing but very little alteration 
in form for upwards of three hours afterwards. The thread-like 
processes at times showed a terminal swelling. When the parasites 
assumed a piriform shape it was only transitorily. The escape of small 
single parasites from corpuscles was never witnessed, and small parasites 
were never seen to divide. In some cases we believe that the 
parasites increased slightly in size during the time they were under 
observation. 
JJ 3/ ¥0 
-^0 S/ 3'3 SS S6 6/ 
Diagram II. N. equi. Illustrating the behaviour of two small parasites within a 
corpuscle during the period 24 to 61 minutes after the blood was drawn. The 
parasites appeared alternately rounded, piriform and of irregular form. (G. H.F.N. 
del.) 
When two small or medium-sized parasites occur within a corpuscle 
(Diagram II) they behave in a manner similar to that of the single 
parasites above described. 
(2) Single mediimi-sized and large parasites (Diagrams III-IV) 
behave very much as do the small ones. They change their shape 
more or less rapidly from round to oval or piriform, or they protrude 
one or two long processes which may or may not possess terminal 
swellings. We rarely observed the protrusion of three pseudopodia by 
amoeboid parasites. 
