Index . 
xi 
PAGE 
Figures. 7. Actual non-protein nitrogen in 1,000 grains (Brenchley) . . 909 
8. Percentage of ash in dry matter (Brenchley) 909 
9. Actual ash contained in 1,000 grains (Brenchley) . . . .910 
10. Actual phosphoric acid contained in 1,000 grains (Brenchley) • 910 
11. Ratio between the nitrogen and phosphoric acid in the grain 
(Brenchley) . . . 91 1 
12. Percentage of dextrose in dry matter of the grain (Brenchley) . 912 
13. Actual dextrose contained in 1 ,000 grains (Brenchley) . . . 912 
14. Maltose produced per 100 parts of dry matter (Brenchley) . . 913 
15. Curve showing the progressive ratios between the dry weights of the 
straw and grain (Brenchley) . . . . . . .913 
16. Dry weights of whole plant and grain (Brenchley) . . . 914 
17. Actual nitrogen contained in whole plant and in 1,000 grains 
(Brenchley) 915 
1 8. Actual ash contained in whole plant and in 1,000 grains (Brenchley) 91 6 
19. Actual phosphoric acid contained in whole plant and in 1,000 grains 
(Brenchley) 916 
20. Percentage of nitrogen in dry matter of straw (Brenchley) . . 917 
21. Percentage of phosphoric acid in dry matter of straw (Brenchley) . 917 
22. Composite curve (Brenchley) .918 
1. Photograph of Pachypodium namaquanum (Lee) .... 930 
2. Diagrammatic transverse section across the stem (Lee) . . . 931 
3. Diagrammatic transverse section of petiole (Lee) . . . .932 
4. Diagram showing the course of the vascular bundles through the 
protuberance (Lee) ......... 933 
5. Diagram of transverse section across young spine (Lee) . . 934 
6. Outline of leaf in transverse section (Lee) ..... 936 
7. Longitudinal section of a stoma (Lee) ...... 936 
8. Longitudinal section through emergence (Lee) .... 937 
I. Section of abnormal prothallus of Pinus maritima, L. (Saxton) . 944 
A. Saintpaulia ionantha, Wend. Normal flower (Dummer) . . 946 
B. Saintpaulia ionantha, Wend. Peloric form (Dummer) . . . 946 
C. Aristea dichotoma, Ker-Gawl. (Dummer) 947 
1-8. Amelanchier spicata (Clark) 948 
1 a, 3 a, 7 a, 8 a. Amelanchier spicata (Clark) 949 
1. Transverse section of peduncle of Ephedra altissima (Thoday and 
Berridge) 957 
II. Series of transverse sections through the female strobilus of Ephedra 
distachya (Thoday and Berridge) 958 
ill. Plan of course of vascular bundles in the female strobilus of Ephedra 
distachya (Thoday and Berridge) 958 
iv. Diagram of series of transverse sections through the node of the 
vegetative stem of Ephedra nebrodensis (Thoday and Berridge) 959 
v. Transverse section through base of ovule (Thoday and Berridge) 960 
vi. Three transverse series through the female strobilus of Ephedra 
altissima (Thoday and Berridge) 961 
vii. Diagrams of three of the numerous uniovulate cones of Ephedra 
altissima (Thoday and Berridge) 962 
viii. Diagram of series of transverse sections through the ovule of Ephedra 
distachya (Thoday and Berridge) 964 
IX. Longitudinal section of ovule of Ephedra distachya (Thoday and 
Berridge) 965 
x. Transverse section of nucellus and inner integument (Thoday and 
Berridge) 965 
xi. Ephedra altissima ovule (Thoday and Berridge) . . . . 966 
Nil. Ephedra altissima ovule (Thoday and Berridge) . , . , 967 
