170 
]1. M. WOODCOCK. 
are usually disposed near the periphery. The limit or border 
of the nucleus is well-defined, but I am a little doubtful 
whether it can be regarded as constituting a true nuclear 
membrane. In some cases there are two of the above- 
mentioned conspicuous bodies, approximately at opposite sides 
of the nucleus (figs. 20, 26) ; these are generally unequal in 
size, neither being as a rule so large as when there is only one. 
Frequently these elements are seen to be surrounded b}' a 
very clear zone or Imlo (figs. 19, 20 and 25). 
In the other type of individual there is usually no such 
large, deeply staining element associated with the nucleus 
(figs. 30, 32-36, 38-40). This contains fairly uniform grains 
of chromatin, which, on the whole, are distinctly more pro- 
minent and stain rather more deeply than those in the nucleus 
of the first type ; now and again one of these grains is seen 
to be somewhat larger than the rest. Neverthess, in a few 
instances, parasites belonging to this second type of form, 
with the nucleus near one extremity, do also show a large, 
deep-staining body in close association with the nucleus 
(figs. 31, 37), which is quite comparable to, or at least repre- 
sents, that seen in the case of individuals of the other type. 
Much more frequently, however (though not always), in 
place of this element close to the nucleus there is noticeable 
a body lying at or near the surface of the protoplasm of the 
])arasite, usually about the middle of its length (figs. 32-36). 
This structure may be nearly as large as that just described, 
but it is generally smaller, and may be very inconspicuous 
(lig. 36); where it is large it stains fairly intensely, but it is 
never so dark and black-looking as in the other cases, and, 
moreover, it has a much duller appearance and not such a 
well-defined outline. 
I pi’opose to leave for the moment the question of the 
signiticance of these bodies. It may be added that in Giemsa- 
stained smears on the other hand, in which the nucleus of 
the parasites generally appears to consist of large, irregular 
or ill defined masses of chromatic substance, it is only seldom 
possible to distinguish a more deeply staining element at 
