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 
