INTRODUCTION 



21 



typical pistil consists of an ovary at the base, a 

 style in the middle and a stigma at the end: 

 within the ovary, as may readily be seen in a cross- 

 section, are the ovules which will develop into 



BUTTERCUP BLOSSOMS 



seeds. In order that this development may take 

 place it is necessary that a grain of pollen should 

 reach the stigma and send a pollen-tube down 

 through the style to fertilize the ovules: this 

 process is called fertilization. The process by 



