various stages in the direct division of the nucleus. Draw cells in 

 which (a) the nndeolns is dk'idiin/, but the nucleus is still spheri- 

 cal, (b) the nucleus is tin nib-bell shaped, (c) the nucleus is divided 

 into two. 



2. PROTOPLASMIC MOYKMKXT. \Villi a pair of fine forceps pull 

 off some of the hairs which grow on the stamens of the flower of 

 the spiderwort (Tradescantia ) and mount them in water under a 

 cover glass. Observe: (i ) The hair is made up of a succession of 

 cells, with corrugated walls. (2) Just within the cell wall is the 

 granular protopasm, strands of which may be seen moving or 

 circulating. (3) \Yithin this protoplasm is a clear spherical or 

 ovoid body, the nucleus. (4) Most of the center of the cell is oc- 

 cupied by a purple, homogeneous fluid, the cell sap. 



Alakc a drawing showing these structures, and indicate by ar- 

 rows the direction of the protoplasmic movement. 



ii 



