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Ecological Adaptation (see Xerophytic). 
Ecology (see Vegetation, Erquy). 
Economic Biologists, The Association of—W.G.F. ... 23 
Economic Botany, Current Investigations in : The Sugar 
Beet—W. G. Freeman ... ... ... . . 18 
Embryogeny in Ephedra distachya, Oogenesis and (Plates 
11.and III.—Ethel M.Berridgeand Elizabeth Sunday 127, 167 
Ephedra distachya ... ... ... ... ... ... 127, 167 
Erquy in 1907, The Bouche d’ (Text-figs. 15, 16)—F. YV. 
Oliver ... ... ... ... ... ... ... 244 
Evolution (see Filicinean Vascular System, Dictyostely, 
Solenostele). 
Fertilization in Ascobolus furfuraceus, Pers. (Plate IV.) 
— E. J. Welsford ... ... . . ... ... 156 
Filicinean Vascular System, Lectures on the Evolution of 
the—A. G. Tansley :— 
I. —The Origin of the Pteridophyta ... ... 25 
II. —The Botryopterideae (Figs. 1-22) ... ... 53 
III. —The Hymenophyllaceae (Figs. 23-33) ... 109 
IV. —The Gleicheniaceae and Lindsayeae (Figs. 
34-46) 135 
V. —The Evolution of the Solenostele (Figs. 
47-50). 148 
VI. —The Evolution of Dictyostely. Polycycly. 
(Figs. 51-64) 187 
VII. —Polycycly, continued (Figs. 65-80) ... 219 
VIII. —The Osmundaceae and Ophioglossales 
(Figs. 81-95). 253 
Geotropism, The Analysis of... ... ... ... ... 10 
(see also pp. 35, 69). 
Gleicheniaceae ... ... ... ... ... ... ... 135 
Gravity, The Sense Organs for ... ... ... ... 69 
(see also pp. 10, 35, 120). 
Gymnosperms, The Xerophytic Character of the—M. C. 
Stopes ... ... ... ... ... ... ... 46 
Heliotropism (see pp. 35, 69, 120). 
Hepaticae, On the Distribution of the, and its Significance 
—D. H. Campbell ... ... ... ... ... 203 
Hybrid between the Cowslip and Oxlip, The Natural 
(Plate V. and Text-figs. 5 and 6)—A. W. Hill ... 162 
Hymenophyllaceae ... ... ... ... ... ... 109 
