314 



DARWINISM 



CHAP. 



i 



a 

 s.s 



Fig. 30. — Oi-clii.s pyraiiiidalis. 

 Description of Figure. 

 . . anther. I ;• . . rostelluui I I' . guiding ridges on labellum. 



. . stigma. I I . . labellum or lip. ] n . nectary. 



A. Front view, with all tlie sepals and petals removed, except the labellum. 



B. Side view, with all the sepals and petals removed and the upper part of the flower 



C. Tlie two poUinia attached to the saddle-shaped viscid disc. [bisected. 



D. The disc after the first act of contraction. 



E. The disc seen from above with one poUlnium removed. 



F. The poUinia removed by the insertion of a needle into the nectary. 



G. The same poUinia after depression has taken place. 



