2s6 Phillips oil 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 princcps, O. Froclilichi, Aphanisomcnon 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 trabeculee. 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- 



