38 LABORATORY AND FIELD EXERCISES 



(b) Spindles. Are the spindle fibers still present in 



early telophase ? Do they form a spindle ? 

 Are these fibers a part of the original spindle 

 seen in metaphase ? If so, to what part of 

 the metaphase spindle do they correspond ? 

 Do you observe any evidence of traction 

 fibers in telophase ? 



(c) Draw an early telophase stage. Label all struc- 



tures accurately. 



(2) Late telophase. Select cells in which the daughter 

 nuclei have begun to form, preparatory to cell 

 division. 



(a) Daughter nuclei. What is their structure ? Have 



they a definite nuclear membrane ? What is 

 the structure of the chromatin in the daughter 

 nuclei ? Is there any evidence of the chromo- 

 somes which were seen in early telophase ? 



(b) The second spindle. The spindle between the 



daughter nuclei is here termed the second 

 spindle, to distinguish it from the first spindle, 

 which was concerned with the division of the 

 nucleus in metaphase and anaphase. What is 

 the form of the spindle which connects the 

 daughter nuclei ? Are the fibers evident in all 

 parts of the spindle ? Are they denser in one 

 part than in another ? Observe dividing cells 

 in which the equator of the spindle extends 

 completely across the cell. 



(c) The cell plate. Do you find the cell plate extend- 



ing across the equator of the spindle ? Does 

 it stain like protoplasm ? What is its sup- 

 posed composition? Does the plate extend 

 completely across the cell in your specimen ? 



