DEVELOPMENT. 



193. Maturation. Examine the prepared section of the uterus of Ascaris containing 

 eggs. Draw eggs, showing : (a) formation of first polar body ; (b) formation of second 

 polar body. 



194. Fertilization. Examine a section from the same uterus. Draw examples of 

 eggs, showing the union of male pronucleus (head of spermatozoon) with female pronucleus. 



195. Segmentation. Examine the series of slides of developing Ascaris eggs. Make 

 drawings to show : two-cell, four-cell, and eight-cell stages. Note the mitotic division. 



