AMITOSIS 



37 



must represent both kinds of spindle fibrils, the rigid and con- 

 tractile fibrils of the achromatic division figure. 



Figure 43 shows the 

 reforming daughter 

 nuclei. The vestiges 

 of the spindle and the 

 process of division of 

 the cytoplasmic body 

 are both well shown. 

 The nucleolus is slow 

 to reappear and all 

 traces of the centro- 

 some have disappeared. 



Technic. Flem- 

 ming's fluid and 

 sublimate are recom- 

 mended for this work, 

 together with the par- 

 affin sectioning method 

 and iron haematoxylin 

 staining. There are no 

 special methods other 

 than a few of the ana- 

 line dyes to make dif- 

 ferential stains of the 

 various parts of the 

 dividing cell. Great 

 care is necessary not to injure the delicate structures by any rough 

 usage. Too quick dehydration will sometimes injure the specimen. 



FIG. 43. Division of nucleus almost completed, 

 ning to divide. 



Cell begin- 



LITERATURE 



The same general works should be read as were recommended for the last chapters. 

 LILLIE, F. R. " Organization of the Egg of Unio," etc., Journ. Morph., Vol. xvii. 



AMITOSIS 



Another kind of cell division is found in which the complex processes 

 studied in mitosis are not present, and the cell divides by a series of auto- 

 constrictions of first the nucleolus, then the nucleus, and lastly the cyto- 

 plasmic body. This is known as direct or amitotic division. Strangely 

 enough this method corresponds almost exactly with Remak's descrip- 

 tion of cell division when he first " discovered" and figured it upon very 



