INTRODUCTION 



SELF-FERTILI- 

 SATION 



Theory of Grew, 

 1682 



the flowers. We all, of course, are 



aware that the little ovule referred 



to is usually hidden in a receptacle 



resembling a vase with a long neck. 



This receptacle is known as the 



"pistil," its neck as the "style," and 



the receptive part above as the 



"stigma." The pollen we have seen 



growing in lilies, in tiny pods 

 upon long slender supports. 

 The support is called the "fila- 

 ment"; the pod, or pollen box, 

 the "anther," and the two to- 

 gether are named the "stamen." 

 Above is given a section of a 

 flower, showing the little ovule 

 its vase, and the pollen falling 



- from its box. And here it 

 will be seen that the pollen 

 falls directly from the an- 



- thers upon the open stigma 

 as Nehemiah Grew ex- 

 plained in his theory, which 

 was accepted and held for 

 more than half a century in 

 spite of the fact that there 



TULIP-TREE FLOWER 



Anthers turned outward Were Certain CaSCS to which 



TRILLIUM 



Stigma above Stamens 



m 



