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 know^n 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 o\iile 

 in its vase, and the pollen falling 

 from its box. And here it 

 w411 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 WCrC Certain CaSCS tO wllich 



TRILLIUM 

 Stigma above Stamens 



