292 Phillips on a Comparative Study of the 
and the blue pigment diffused in the cell sap; Hieronymus 
and Meyer. 
V.—tThe blue and green pigments both in the same very 
minute granules, which are themselves embedded in, and 
connected by, a protoplasmic thread with each other and 
with a hyaline-like layer of peripheral protoplasm on the 
outer side and with a protoplasmic pellicle, or pocket, sur- 
rounding the central bodies, much as the nucleus of Spiro- 
gyra is surrounded; Hegler. 
In higher plants the chromatophores appear to be seg- 
mented off from the nucleus. They seem to require some 
nuclear constituent before they are able to perform their 
function. It is not improbable that there may be some 
nucleoplasm in the outer zone of the Cyanophycez which has 
not yet been aggregated into definite forms as in the higher 
plants, and its function, together with that of the coloring 
matter, not yet divorced from the functions of the cyto- 
plasm. Indeed this would be suggested by the fact that the 
peripheral protoplasm retains a very diffused coloring with 
Heidenhein’s iron-ammonia-alum hematoxylin and other 
nuclear stains. This quite strongly differentiates it from 
the delicate surrounding colorless layer of ectoplasm which 
lines the cell wall. Such diffused staining is increased or 
diminished according to the composition of the culture fluid, 
as explained below for the chromatin of the central body. 
The Granules. 
Besides the chromatin vesicles of the central body which 
have already been discussed, two other forms of granules 
may be found in the outer protoplasmic zone of the Cyano- 
phycez. Of these, the most common are the cyanophycin 
granules which permeate the greater portion of the periph- 
eral zone, especially the outer portion of it just under the 
thin ectoplasmic layer mentioned above. These granules 
are variable in number, being more numerous in plants 
