798 1 A. MINCHIN. 
(5) The Nuclear Apparatus. 
Under this head I include simply the two nuclei, tropho- 
nucleus and kinetonucleus. I will begin my account with the 
second of these two bodies. 
The kinetonucleus is easily made out in the living condition 
or in the standard preparations as a refringent body of fair 
size a short way from the hinder end. It is also seen, espe- 
cially in the fixed preparations, that there are two types of 
form presented by the kinetonucleus, which may be either 
rod-shaped or circular in contour. Transitions occur, but not 
commonly, between these two types. 
With iron-hematoxylin the kinetonucleus stains black ; the 
rod-like type stains much more darkly than the round form, 
which appears of a pale greyish tint when the stain is well 
extracted ; it is then not so dark in tint as the blepharoplast, 
which is seen as a black dot on the edge of the kinetonucleus 
(figs. 31, 35). The rod-shaped type of kinetonucleus, on the 
other hand, takes the stain more darkly than the blepharoplast 
which is seen close beside it, not overlapping it (figs. 32, 34). 
By all nuclear stains the kinetonucleus is stained intensely, 
more so than any other part of the body, in fact it may be 
the only part of the body visible in the preparation. After 
methylene-blue-eosin it is blue; after Twort’s stain, red; 
atter the Romanowsky stain, as is well known, it stains a 
deep purple-red ; what is not so generally known is that it 
comes out, as I have already pointed out, four or five times its 
natural size (compare figs. 62, 63, with figs. 10,11). When, 
however, the Romanowsky stain is suitably extracted, the 
kinetonucleus comes down to the size that it appears in other 
preparations (figs. 66, 69, ete.). 
I have not been able to make out any structure in the 
kinetonucleus. It appears to consist simply of a dense mass 
of chromatin, which is carried on, or impregnates, a basal 
substance, for which the name “plastin” is in common use. 
With regard to the two forms of the kinetonucleus, it is 
possible that these may be simply two views of the same 
