Xii CONTENTS. 



CHAPTEE III. 



ARETHUSE^. 



Cephalantliera grandiflora; rostellum aborted; early penetration of 

 the pollen-tubes; case of Imperfect self-fertilisation; cross- 

 fertilisation effected by insects which gnaw the labeUum — 

 Cephalanthera ensifolia — Pogonia — Pterostylis and other 

 Australian orchids with the labellum sensitive to a touch — 

 Vanilla — Sobralia Pages 80-92 



CHAPTEE IV. 



NEOTTE^. 



Bpipactis palustris ; curious shape of the labellum and its import- 

 ance in the fructification of the flower — other species of Bpi- 

 pactis — Epipogium — Goodyera repens — Spiranthes autumnalis ; 

 perfect adaptation by which the pollen of a younger flower is 

 carried to the stigma. of an older flower on another plant — 

 Listera ovata; sensitiveness of the rostellum; explosion of 

 viscid matter; action of insects; perfect adaptation of the 

 several organs — Listera cordata — Neottia nidus-avis; its 

 fertilisation effected in the same manner as in Listera — Thely- 

 mitra, self-fertile 93-127 



CHAPTEE V. 



MALAXEiB AND EFIDENOBEiB. 



Malaxis paludosa — Masdevallia, curious closed flowers — Bolbo- 

 phyllum, labellum kept in constant movement by every breath 

 of air — Dendrobium, contrivance for self-fertilisation — Cattleya, 

 simple manner of fertilisation— Bpidendrum — Self-fertile Epi- 

 dendreaa 128-148 



