132 COLLEGE BOTANY 



number of chromosomes. The relationship of this prooesSi to- 

 inheritance of characters will be given further consideration in 

 Chapter XXI. 



LABORATORY EXERCISES. 



Exercise 1. Examine slides of root tips of onion or other plants showing 

 mitosis. Study carefully and make drawings showing the different stages. 



Exercise 2. Examine prepared slides of material (anthers of floweiring 

 plants or sporangia of ferns), showing reduction division. Study care- 

 fully and make drawings of as many stages as possible. 



