REINHOLD BOOKS IN THE 

 BIOLOGICAL SCIENCES 



Consulting Editor: 

 Professor Peter Gray 



Department of Biological Sciences 

 University of Pittsburgh 

 Pittsburgh, Pennsylvania 



Cover photograph courtesy of Dr. Daniel 

 Mazia, University of CaUfornia, Berkeley. 

 Phase-contrast Photomicrograph of Mi- 

 totic Apparatus Isolated from Eggs of the 

 Sea Urchin. (See Figure 6-4 on page 145.) 



