40 



GENERAL ANATOMY. 



well developed, but shows only slight indications of activity. (2) The chromatic 

 fibrils, after rearranging themselves, become thicker, and probably combine in 

 one long filament, which forms a loose convolution. This is called the c/lomerulus 

 or skein (Fig. 6, B). At the same time a number of protoplasmic granules arrange 

 themselves at two points in the cell-protoplasm opposite each other ; these points 

 are called the poles, and the line midway between them, and bisecting at right 



SIDE 



OR EQUATORIAL 



VIEW. 



END OR POLAR 

 VIEW. 



^ 



SIDE OR EQUATORIAL 

 VIEW. 



A. 



FIG. 6. Karyokinesis, or indirect cell-division. Diagram explaining the formation of the chromatic and 

 achromatic karyokinetic figures in epithelial cells. The radiating arrangement of protoplasmic granules is 

 also indicated, although it is in the ova of the lower animals that this appearance has been more specially 

 studied. All the figures are simplified for diagrammatic purposes, but represent stages which can easily be 

 recognized in specimens properly stained. The longitudinal splitting of the filaments has not been repre- 

 sented. A. Resting nucleus, the nuclear network deeply stained. B. Glomerulus, convolution or skein, c. 

 Rosette or wreath. D. Aster or monaster. E. Diaster or daughter star. F. Daughter rosettes. G. Daughter 

 glomeruli or skeins. H. Daughter nuclei. (By Dr. S. Delepine.) 



angles a line connecting the two, is called the equator. The aggregations of 

 protoplasmic granules are termed the centrosomes, and they are surrounded by 

 clear protoplasmic areas known as the archoplasm spheres. (3) The chromatic 



