256 Phillips on a Comparative Study of the 
appears to be, the central body was widely different from the 
cell nucleus, though the two might probably have originated 
from a common organ.” 
Marx (53) confined his attention mostly to micro-chem- 
istry, and from this standpoint his paper is of considerable 
interest. Morphologically he concluded that the cells seldom 
showed a central body. He could stain the granules of the 
cells black with osmic acid and concluded that “in spite of 
the many repeated attempts, it is not possible to determine 
the existence of a cell nucleus.” 
Deinega’s observations (21) were carried out on Oscil- 
laria princeps, O. Froehlichi, Aphanizomenon flos aquae, 
Nostoc (sp.) and Scytonema (sp.), and were directed 
toward solution of the problems presented by the granules, 
the nucleus and the chromatophore. He found a chroma- 
tophore in the form of a plate lying next to the inner wall of 
the cell and running parallel to the longitudinal axis of the 
trichome, the coloring matter being in trabecule. He found 
granules of only one form which were grouped along the 
cell wall in Oscillaria, and which, from staining reactions 
and micro-chemical tests, he considered to be an isomer of 
starch, but not paramylum as held by Cohn (16) and Hans- 
girg (34). He was able to stain the central body more 
deeply than the surrounding cytoplasm and considered it to 
be composed of a conglomeration of granules, but he did 
not assign to it the function of a nucleus, leaving this ques- 
tion open because he could not demonstrate the central body 
in all cells by the use of hematoxylin and other reagents. 
He attributed the “nuclein luster’? caused by digestion in 
artificial gastric juice to the remains of the chromatophore, 
and supported his work by check experiments on Spirogyra. 
The appearance which Scott interpreted as cell division, he 
considered to be an artifact caused by the swelling of the 
cyanophycin grains along the cell walls which thereby gave 
the appearance interpreted as division. Zacharias (90) in 
an objection to these views, showed definitely that the con- 
