LIST OF ILLUSTRATIONS 
FRONTISPIECE.— Desert types : 
1, Rhipsalis pachyptera. 2, Haworthia Chalwinii. 3, Cereus 
celsianus. 4, Cereus nigricans. 5, Aloe Davyana. 
6, Cotyledon undulata. 7, Haworthia  tesselata. 
8, Crassula columnaris. 9, Mammillaria plumosa. 
10, M. obcordellum. 11, Mesembryanthemum Pearsont. 
a2, M. Leshernay 5, 6, 7;)8. 10, 11,, 12, from. South 
Africa, 1,3, 4, 9, from Central and South America. 
A Burrowing Lichen, Verrucaria calciseda_ - - 
The Glasswort, Salicornia europwa = - - 
. Mesembryanthemum Bolusit and M. Lesliei  - 
. Wild Carrot, Daucus Carota (grown under great ex- 
posure) - - - - - 
. Inrolled Leaf of Crowberry, Empetrum nigrum - 
. Succession of Vegetation in Lakes: a, Marsh Zone. 
b, Reed Zone. c, Zone of Floating Vegetation. 
d, Zone of Submerged Vegetation (diagrammatic) 
. Coral Root, Dentaria bulbtfera - : ‘ 
. Fruit of Giant Bell-flower, Campanula latifolia - 
. Fruit of Geranium . - - : 3 
. Fruit of Viola - - - : ‘ 
. Fruit of Erodium - - - : 
. Diagram illustrating Fall of Seeds - 
. Wing-seeds and Plume-seeds - - - 
. Flower of Erodium~ - - - s ul 
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