X 
Index . 
Figures. 
5 , 6 . 
7 , 8 - 
9 - 
i. 
3 - 6 . 
7 - 
I— 5* 
2 . 
I. 
2 - 4 . 
5 - 
6 . 
7 - 
8 . 
9 - 
TO. 
IT, 12. 
13-16. 
17 * 
18,19. 
20 , 21 . 
22, 22 a. 
2 3 - 
24. 
2 , 3 - 
PAGE 
Variation curves for Clematis vitalba (Salisbury) iy 
Clematis vitalba. 7. Proportion of abortive to normal carpels. 8. Diagrammatic 
representation of a branch bearing a number of small inflorescences ; by its sides «, 
the variation curve for the gynaecea (Salisbury) 112 
Variation in androecium and gynaeceum of Ficaria verna (Salisbury) . . . 115 
Certain Archaic Features in the Seed of Taxns baccata (Sahni) .... 119 
,, ,» >, ,, ,, ,,-••• *20 
I 2 I 
yy yy yy 91 yy yy 1 A 
1. Ginkgo 2. Cardiocarpus. 3. Cycadinocarpus. 4. Rhabdospermum sub- 
tunicatus. 5. R. cyclocaryon. 6. Mitrospermum. 7. Taxospermum. 8. Taxus. 
9. Pre-Torreya stage (hypothetical). 10. Torreya. 11. Cephalotaxus (Sahni) 125 
Gemmae of Tortula mutica, Lindb. (Bristol) . . . . . . .138 
Teleutospores of Puccinia malvacearum germinated in sterile tap-water in a watch- 
glass (Bailey) 179 
Hollyhock Globe No. 9 and Control Pot No. 7 (from a photograph taken on 
June 27, 1914) (Bailey) 189 
A-o. Series of transverse sections through the base of the primary axis of a sporeling — 
passing from the root upwards to the base of the first internode (Barratt) . 205 
2. Longitudinal section of basal region of primary axis, showing an early stage in 
the development of the first lateral bud. 3. Diagram illustrating the apex of 
a sporeling, showing the independent development of the internqdal xylem 
strands of successive internodes. 4. Diagram of apex of older shoot, illustrating 
the xylem development prior to the differentiation of the metaxylem (Barratt) 207 
Transverse section from base of primary axis, showing origin of the first bud 
(Barratt) 208 
Diagram of sympodial underground stem system of a sporeling (Barratt) . . 209 
Transverse section of base of secondary axis, showing siphonostele (Barratt) . 210 
Diagram illustrating late development of the metaxylem. Length of internodes 
much reduced (Barratt) . . . . . . . . . .213 
Transverse section of a bundle from a normal tuber of Equisetum arvense (Barratt) 214 
Diagram of transverse sections of abnormal tuber. A. Close below a node. 
b. Middle of the internode (Barratt) 215 
11. Transverse section of a vascular bundle of an anomalous tuber of E. arvense 
close below a node. 12. Transverse section of a bundle from the middle of the 
same internode of anomalous tuber (Barratt) 216 
Cells of the node of a vegetative bud of E. arvense seen in longitudinal tangential 
view, showing four stages in the development of the nodal tracheides (Barratt) 218 
Diagram illustrating the vascular system of the sporeling of E. limosum with the 
forked axis (Barratt) 220 
18. Diagram representing half a young cone of E. palustre. 19. Xylem strand of 
cone and the first differentiated tracheide of the sporangiophoric trace from young 
cone of E. palustre (Barratt) 222 
20. Transverse section of bundle from cone of E. palustre. 21. Transverse section 
of bundle from cone of E. maximum (Barratt) .224 
22. Diagram illustrating the vascular system of the cone of E. arvense. 22 a. Part 
of the vascular system of a cone of E. arvense, showing more extensive tracts of 
metaxylem (Barratt) 225 
Diagram illustrating the arrangement of the xylem strands of a cone of E. maximum 
(Barratt) 226 
Diagram showing bundles from : a, cone ; B, abnormal tuber ; c, normal tuber ; 
d, internode of stem (Barratt) 230 
Divergence of the sporangiophore traces of the lowest whorl of Cone A of Equisetum 
hyemale (Browne) 239 
2. Longitudinal reconstruction of the xylem of Cone A of E. hyemale. The xylem 
of the stele is drawn as though cut and spread out flat. 3. Longitudinal recon- 
struction of Cone B of E. hyemale (Browne) , . 242 
