GROWING LYMPHATICS AND THE MESENCHYME 



371 



and, at the center, a ring-like depression occurs. This increases 

 quickly in depth until, in three or four minutes, the two daughter 

 cells are connected by only a narrow process (fig. 14, E). At 

 this time the retraction of the processes is most pronounced, 

 while the ones not entirely retracted are extremely thin. Soon 

 however, what seems like a relaxation of the protoplasm occurs, 

 and the two daughter cells expand and commence to send out 



C. 136 PM D. I 37RM. 



A. 12 21P.M. B 121 PM 



150PM 



59 P.M. 



G. 5 00 P. M (appro*) 



Fig. 14 Drawing to illustrate the mitotic division of a mesenchyme cell, 

 from same larva as shown in figs. 2 to 13; C and D are incomplete. This division 

 was observed on May 22. The position of the two daughter cells on the follow- 

 ing day, May 23, is shown in fig. 11, Z 1 and Z 2 . 



processes. For some time a slight process connects the two cells, 

 but after about two hours, they are completely separated. The 

 sending out of new processes takes place rapidly. For a time after 

 the disappearance of the nuclei the two new cells have a -finely 

 granular appearance, which distinguishes them from the other 

 cells. This is gradually lost, and eventually the new cells take 



THE AMERICAN JOURNAL OF ANATOMY, VOL. 13, NO. '■'> 



