172 



ORCHIS. 



[CHAP. 



and thus to expose the two viscid balls (dd). Now 

 suppose an insect visiting this flower: it alights on 



FIG. laa. FIG. 123. 



Fie. i2i. Side view of flower, with all the petals and sepals cut off except the 



hp, of which the near half is cut away, as well as the upper portion of the near 



side of the nectary . 



FIG. 122. Front view of flower, with all sepals and petals removed except the lip. 

 FIG. 123. The two pollinia. 



the lip (/), and pushing its proboscis down the nec- 

 tary to the honey, it can hardly fail to bring the 



