250 Phillips on a Comparative Study of the 
quite possible, he thought, that a delicate connection existed 
between them and the central body, “but,” he continued, “we 
cannot decide with certainty whether the central substance 
of the Cyanophycez corresponds or not to the cell nucleus 
of other organisms.” 
Butschli’s investigations (7) extended over the Bacteria 
and Cyanophycee, especially such forms as Ophidomonas 
Jenensis, Chromatium Okenti, and other forms of bacteria 
and spirilla from marsh water, and several forms of Beg- 
giatoa, Cladothrix, Oscillaria and Nostoc, all of which he 
repeatedly investigated, and always found the cells of all 
forms corresponding to the same general type. This type 
consisted of a bounding membrane or cell wall, which he 
regarded as a plasma structure. Within this was the chro- 
matophore, a thin colored rind-layer of plasma having a 
netted or honeycombed structure and surrounding the color- 
less “central body.’’ In the bacteria the central body was 
not demonstrable in all forms, but when it was present it was 
colorless and drawn out, and the surrounding zone was accu- 
mulated at its poles. On staining with hematoxylin he 
found the “central body” to be netted, or with a coarser 
honeycombed appearance (Wabenstruktur). At the nodal 
points of the web-structure, in material killed in alcohol or 
dried, he found granules which stained a red-violet with 
weak hzmatoxylin. They were very abundant and even 
jutted out into the surrounding chromatophore and some- 
times were found isolated in the surrounding crust layer, 
but when so found, were always small. These he termed 
“red granules” on account of their staining properties with 
hematoxylin. He could not stain them thus in material that 
had been killed in corrosive sublimate, osmic acid mixtures, 
or picro-sulphuric acid. They stained intensely green with 
acetic acid methyl green. After treatment with artificial 
gastric juice, they no longer stained characteristically with 
the hematoxylin, but he did not think that they weredigested 
out, but had merely lost their staining properties. He denied 
