30 JouRNAL OF COMPARATIVE NEUROLOGY. 
The minute corpuscles or the centrosome bodies, larger 
than the rest of the microsomes, are in every case located 
centrally in the centrosphere. The corpuscle is a somewhat 
roundish body which stains very deeply with eosin or erythrosin 
as in the case of the microsomes, The number of the cor- 
puscles which form the centrosome is variable, ranging from 
one or two (Figs. 1, 2, 3, 5, 7, 8, 9, Io) to a greater number 
(Fig. 4, 6, 11). Two corpuscles, however, occur in most cases. 
When the corpuscles occur in great number, they lie close to- 
gether filling up the central area within a certain limit. It is 
very doubtful whether we should regard these numerous cor- 
puscles as equivalent to the simpler centrosome composed of one 
or two corpuscles, because in these cases, the size of the all 
minute corpuscles is not similar and furthermore, all the corpus- 
cles do not stain with the same intensity, one or two corpuscles 
which are located most centrally in these groups being distin- 
guishable from the’ remainder. For this reason, the present 
writer suggests that some of the corpuscles are nothing more 
than ordinary microsomes which swell abnormally and are also 
located accidentally in the neighborhood of the centrosome. 
This interesting fact will be discussed later. Very often, the 
writer observed only one corpuscle within the centrosphere 
(Fig. 7). This appearance has been described by almost all 
investigators who have studied the centrosome in the nerve cells 
but this may be due to the fact that the plane of the section 
passes between the two corpuscles. 
Fig. 1 is a section through a spinal ganglion cell of an 
adult white rat weighing 150 grams. The material was-pre- 
served with Gitson’s fluid followed by iron hematoxylin and 
bordeaux red. In this case, the sphere lies very close to the 
nucleus as BUHLER figured it in a spinal ganglion cell of a frog. 
The radial arrangements of the protoplasm exist only at the 
region of the plasmosphere but not within the centrosphere as 
is the case in the embryonic cell. The centrosphere is some- 
what oblong in shape with two conspicuous centrosomes in the 
central region. This area, ‘‘the centrosphere,” is clear in its 
appearance with minute microsomes sometimes densely and 
TOR Se 
