38 1 i V o , Mitotic division nf thc niiclei of the Cyanopliyceae. 



are iisually dooply imbedclod in one side of tlie nuclear Ijody 

 (p. 34). 



I have been unablo to find any indication of oil or glycogeii 

 in Osc'iUator'io. 



15. Experiments with peptic digestion resulted in the con- 

 clnsion that some of the cytophism itself is digested, as ^vell as 

 the cyanoph^'cin. Miic]i of tlie protoplasinic contents, lio\vev(!r, 

 a])pears to remain unaffected, so that one may see clearly in 

 digested sections the shrunken chromatophore and central body, 

 togetlier with tlie refractive granules of indigestible chromatin (p. 34). 



16. For the reasons that the niu.'lei of the vegetative fila- 

 ments show occasional indications of the f ormation of a membranc ; 

 and, that in spores and heterocysts, we iind at least a beginning 

 of the f ormation of the usual resting condition; and, finally, that 

 the mitotic processes wliicli take place in these plants are simi- 

 lar to those of higher organisms, we are justified in the conclu- 

 sion that the central body of the Cyano'phyceae is not essentially 

 different from the nucleus of the higJicr plants. It may, howev- 

 er, be called a primitive nucleus from the fact that the chrom- 

 osomes appear to be made up of a single chromomere, and, 

 socondly, because of the unusual simplicity of the spireme of 

 (rlopocapiia. 



Madison, Wisconsin, U. S. A. 



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