CONTENTS. Xm 



CHAPTEE VI. 



v^NDBa:. 



structure of the column and poUinia — Importance of the elasticity 

 of the pedicel ; its power of movement — Elasticity and strength 

 of the caudicles — Oalanthe with lateral stigmas, manner of 

 fertilisation — ^Angrsecum sesquipedale, wonderful length of nec- 

 tary — Species with the entrance into the stigmatic chamber 

 much contracted, so that the pollen-masses can hardly be 

 inserted — Coryanthes, extraordinary nianner of fertilisation 



Pages 149-177 



CHAPTEE VII. 



YANDEX continued. — catasetid*. 



Catasetidse, the most remarkable of all Orchids — The mechanism- 

 by which the poUinia of Catasetum are ejected to a distance and 

 are transported by insects — Sensitiveness of the horns of the 

 rostellum — Extraordinary difference in the male, female, and 

 hermaphrodite forms of Catasetum tridentatum — Mormodes 

 ignea, curious structure of the flowers ; ejection of the poUinia 

 — Mormodes luxata — Cycnoches ventricosum, manner of fer- 

 tilisation 178-225 



CHAPTEE VIII. ^ 



CTPKIPBDBa; — HOMOLOGIES OF THE FLOWERS OF OEOHIDS. 



Cypripedium, differs much from all other Orchids — Labellum in 

 the form of a slipper with two small orifices by which insects 

 can escape — Maimer of fertilisation by small bees of the geijus 

 Andrena — Homological nature of the several parts of the flowers 

 of the Orchidese — "Wonderful amount of modification which 

 they have undergone 226-246 



