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. 
