214 J- MCA. KATER. 



to obscure the linin strands, and, consequently, they are very 

 generally visible (Fig. 12). 



One might ask why the number of linin strands seen in the 

 telophase and in resting nuclei is so small in comparison with the 

 number of chromosomes in Phaseolus. It is only necessary to 

 consider again that the nucleus has three dimensions and that, 

 when observing a complete nucleus many of the linin strands 

 are seen in end view, and it is only the ones in a plane parallel 

 to the slide that are seen as definite lines. 



In the resting nucleus there is a much greater abundance of 

 scattered chromatin than in the interphase. Likewise there is a 

 compensatory decrease in the size of the nucleolus and the scat- 

 tered granules come up almost to the nucleolus, leaving a very 

 small perinucleolar zone. When tissue is fixed in Benin's small 

 sections of the linin strands can be made out, but after fixation 

 in Flemming's strong the linin strands are rarely seen in such 

 nuclei. The abundance of scattered chromatin obscures them 

 (Fig. 1 1). There can be no doubt as to their presence because in 

 the same area of a ripe embryo, when the scattered chromatin 

 has disappeared, they are quite evident and are invariably visible 

 in interphase nuclei. 



In properly fixed cells the nuclei have no resemblance whatever 

 to the perfect reticulated network figured for plant nuclei by 

 Gregoire (1904) and Sharp (1914). A somewhat similar structure 

 is found in the second zone of Flemming's fixation, mentioned 

 above. Slight indications of the chromatin bands which Sharp 

 identifies as chromosomes may also be seen (Fig. 13). It seems 

 probable that such slight distortion does not actually mislead 

 the observer, but merely clumps the chromatin of each individual 

 chromosome and enables the observer to trace structures which 

 otherwise he could not recognize. 



Before concluding this description of the resting nucleus we 

 should emphasize the existing relationship between the chromo- 

 somes, as outlined in the description of the reconstruction of 

 daughter nuclei. Every chromosome in the resting nucleus must 

 be essentially a pentagon with four of the sides equal triangles 

 while the fifth side has a convex surface and serves as a part 

 of the nuclear membrane. The inner point of this wedge-like 



