Index. 
xi 
Figures. 
3 a and b. 
i. 
2. 
3 - 
4 * 
5 - 
6 . 
7 - 
8 . 
9 - 
10. 
11. 
12 . 
13 - 
14. 
15 . 
16. 
17 - 
18. 
1 9 . 
20 . 
21 . 
22 . 
23 - 
24. 
2 . 
I. 
2 . 
3 - 
4 - 
5 - 
6 . 
7 * 
8 . 
9 - 
10. 
1 a. 
1 b. 
Enlarged drawings of parts of an Exocarpus root with haustorium 
(Benson) .... 
A series of transverse sections through an internode and part of a node 
of Solenostelopteris japonica (Kershaw) 
Apparatus for growing plants in the absence of carbon dioxide 
(Miller) .... 
Stage I of seedlings (Miller) . 
Stage II of seedlings (Miller) . 
Stage III of seedlings (Miller) 
Stage IV of seedlings (Miller) 
Stage V of seedlings (Miller) . 
Relative weight of hypocotyls and cotyledons (Miller) 
Water content, per cent, on wet basis (Miller) 
Water content, grams per 100 seedlings (Miller) 
Ash, per cent, on dry basis (Miller) ... 
Ash, amount in grams per 100 seedlings (Miller) . 
Proteid-free nitrogen, per cent, of dry material (Miller) 
Proteid-free nitrogen, grams per 100 seedlings (Miller) 
Total nitrogen, per cent, of dry material (Miller) . 
Total nitrogen, grams per 100 seedlings (Miller) 
Ether extract, per cent, of dry material (Miller) 
Eth-er extract, grams per 100 seedlings (Miller) 
Free fatty acid, per cent, of ether extract (Miller) . 
Total sugar, per cent, of dry material (Miller) 
Total sugar, amount in grams per 100 seedlings (Miller) 
Reducing sugar, per cent, of dry material (Miller) . 
Reducing sugar, grams per 100 seedlings (Miller) . 
Cellulose, per cent, of dry material (Miller) . 
Cellulose, weight in grams per 100 seedlings (Miller) 
Diagram of section through distal end of pro-embryo of Welwitschia 
(Pearson) .... 
Outline of longitudinal section through distal end of embryo of We 
witschia (Pearson) .... 
Arrangement for germinating barley (Irving) 
Photosynthesis (Irving) .... 
55 
y> 
yy 
yy 
yy 
y 5 
yy 
yy 
yy 
yy 
yy 
Group of sporangia in association with a rachis of Botryopteris antiqua 
(Scott).' 
Megaspore ofLepidodendron Veltheimianum with prothallus (Gordon) 
Prothallus of 1 a (Gordon). 
page 
671 
684 
700 
702 
702 
7°3 
7°3 
704 
711 
713 
7*3 
714 
7 r 4 
7*5 
715 
716 
716 
717 
718 
719 
720 
720 
721 
721 
722 
722 
759 
761 
806 
807 
808 
809 
811 
813 
814 
815 
816 
817 
820 
822 
822 
