PLATE III. 



Flowers 1 and 2 were pollinated March 3, two days before they would have been 

 fully open, No. 2 being emasculated. Thirty-nine hours after being pollinated these 

 flowers had fallen. No. 1 shows the anthers just opening. 



Flowers 3, 4, and 5 were emasculated February 27. No. 3 was not pollinated, 

 while Nos. 4 and 5 had their stigmas coated over with corn flour. March 5, Nos. 

 3 and 4 were still fresh, while the corolla of No. 5 had fallen and the ovary begun to 

 enlarge. 



No. 6. — A ripe pod torn open to show normal seeds for comparison with chaffy 

 seeds that sometimes form in pods the flowers of which were not pollinated or had 

 other substances substituted for pollen as in Nos. 9 and 10. 



No. 7. — A normal ripe seed pod. 



No. 8. — A green pod formed from a flower which was emasculated and had its 

 stigma coated with air-slacked lime. 



Nos. 9 and 10. — Ripe pods of experiment 45 in which the stigmas were coated 

 with corn flour. After being photographed pod 9 was examined and found to con- 

 tain only light, chaffy seed like those shown in the opened pod 10. 

 46 



