40 THE ELEMENTS OF STRUCTURE. 



DIAGRAM II. 

 The Cell. 



I. The figure marked Cell I. shows the cell-substance [c.s.) with 



granules and network, and the nucleus (».)) with a coil of chrom- 

 atin threads. (After Carnoy. ) 



II. The figure marked Cell II. shows several adjacent cells with 



inter-cellular bridges of protoplasm between their cell-walls. 

 (After Pfitzner.) 

 The lower half of the diagram shows the process of Karyokinesis. 

 (From Hatschek, after Flemming.) 



1. Shows the nucleus with a coil of chromatin threads {b in 



text, pp. 43-44). 



2. Shows an aster at the equator of the nucleus (c in textV 



3. Shows the longitudinal division of the chromatin loops 



{d in text). 



4. Shows the diaster in which the halved chromatin loops are 



receding towards the poles {e in text). 



5. Shows the polar position of the chromatin elements, and 



achromatin threads between them [e in text). 



6. Shows the division of the cell, and the beginning of the 



process in which the daughter-nuclei are reconstituted 

 (/in text). 



