174 
E. A. M INCHIN AND H. M. WOODCOCK. 
among the smaller and the larger individuals met with, so 
much so that many of these parasites show in stained pre- 
parations what has been described as a leaf-like appearance 
or shape (figs. 12, 30, and 31). This is seen chiefly in smears 
made from the peripheral blood, and is only exceptionally 
found in the case ot‘ individuals on smears made from the 
bone-marrow. Here also we have come to the conclusion 
that this wide, leaf-like appearance is largely or almost 
entirely due to the (artificial) flattening-out of thick, fusiform 
parasites on thinly spread smears. This view is borne out by 
a comparison of this type of parasite as it occurs in films 
prepared by the wet method and stained by iron-haematoxylin. 
All the parasites observed have the form of a stout spindle 
(figs. 40-42) ; but no leaf-like individuals have been seen on 
wet films. Moreover, in the leaf-like forms the tropho- 
nucleus appears more or less transversely elongated (figs. 12, 
29, 30), which is never the case in any other form of the para- 
site; compare Min cliin (13, p. 17) on similar forms of 
Trypanosoma percae. Hence, in arriving at a correct esti- 
mate of the proportions of the summer type of the parasite, 
such flattened-out individuals are best left out of considera- 
tion, since their breadth probably appears considerably 
greater than is actually the case. 
Fig. 13 shows the typical appearance of a trypanosome of 
this stout, fusiform type, this being a fairly large individual. 
Its length is 32 jjl, greatest breadth or thickness (including 
the undulating membrane) 4fju, aud the length of the free 
flagellum 9 jjl. Rather smaller parasites are seen in figs. 25 
and 26, the former being 30 p long, 4j ju broad, and the free 
flagellum 7 ju, while the latter is 34 jjl long, accounted for by 
the much longer flagellum of 12/*, and 4J ju broad. Of 
the flattened, more leaf-like individuals those of figs. 31 
and 30 correspond in reality closely, we have no doubt, to 
the above-mentioned parasites. The former is 32 jjl long, the 
free flagellum being 6J /u, and its width appears to be 6J^u; 
the latter is 291 fi long, the flagellum being 8 /u, while the 
width is apparently as much as 7J jji. This latter parasite 
