J 



7 



Explanation of the Figures. 

 These figures are intended to illustrate the behaviour of the chromosomes during division. 

 They are all purely diagrammatic. 



Figs. 1-3. — An ordinary vegetative mitosis. 

 ,, 4-7. — The first "reduction " division. 



„ 8-10. — The second " reduction " division as it occurs in Plants and in some animals. 

 „ viii.-x. — The second " reduction " (true) division as it is said to occur in certain animals. 

 [Figs. 9 and ix. correspond to Figs. 3 and 7, and Figs. 10 and x. illustrate a later stage than 

 is shown in the preceding series.] 



