212 EYE SPY 



ference in size of the pollen-grain of the two flow- 

 ers, those of the high anthers being much larger 

 than those from the lower anthers. These larger 

 grains are intended for the high stigma, which 

 they are sure of reaching, while those of smaller 

 size, on the top of the tongue, which should hap- 

 pen to be wiped off on the high stigma, are too 

 small to be effective for fertilization. 



