"Blossom Hosts and Iiisect Guests 



'T^n.iir 



^;r 



other to the position D. This change takes place 

 as the moth is flitting from flower to flower. At E 



we see the moth with 

 its tongue entering the 

 nectary of a subsequent 

 blossom. By the new 

 position of the pollen 

 clubs, they are now 

 forced directly ao^ainst 

 ' the stigma (E). This 



^^^^'^^^^^^^ surface is viscid, and as 

 the insect leaves 

 the blossom re- 

 tains the grains 

 in contact (F), 

 which in turn 

 withdraw others from 

 the mass by means of 

 the cobwebby threads 

 by which the pollen 

 grains are continu- 

 ously attached. At G 

 we see the orchid after 

 the moth's visit — the 

 stigma covered with pollen, and the flower thus 

 cross-fertilized. 



144 



Fig. 



