Index. 
xi 
Figures. 
8 . 
io. 
1. 
2 . 
3- 
4 , 5 ' 
6 , 7. 
I, 2. 
3,4- 
PAGE 
belonging to one of the leaves at the second epicotylar node of a young plant 
(Thoday) 498 
Sections of the median trace bundle of the leaf (already mature) at the seventh node 
of a vigorous plant : (1) in internode VII; (2) in internode V ; (3) in internode 
IV (Thoday) ............. 500 
A-D. Median trace bundles at one level, belonging to leaves at four successive nodes 
above the plane of section, drawn from the section shown in Fig. 4 and Plate 
XVII, Fig. 5, illustrating the behaviour of the fascicular cambium at different 
distances from the leaves (Thoday) 501 
Sections of the stem of a starved dwarf plant already flowering. (1) First epicotylar 
internode. (2) Third internode. (3) Sixth internode, near the capitulum 
(Thoday) 503 
Course of absorption of neutral red, by living carrot tissue, from solutions of various 
concentration (Redfern) 513 
The relation between final internal and final external concentrations in the case of 
living carrot tissue immersed in solutions of neutral red (Redfern) . . *515 
The relation between final external and final internal concentrations in the case of 
living carrot immersed in solutions of methylene blue (Redfern) . . .516 
4. The relation of final external and final internal concentrations in the case of 
potato tissue immersed in solutions of neutral red. 5. Absorption of methylene 
blue from solutions of various concentrations by dead carrot tissue (Redfern) . , 517 
6. Relation of final internal and final external concentrations in the case of dead 
carrot tissue immersed in solutions of methylene blue. 7. Absorption of methy- 
lene blue from o-oi per cent, solution by living carrot tissue at different tempera- 
tures (Redfern) 518 
Absorption of methylene blue from 0-005 per cent, solution by living carrot tissue 
at different temperatures (Redfern) 519 
A. Transverse section of one-year-old stem of arborescent or fruticose Dicotyledon 
which is devoid of wide, high multiseriate rays. B- Ditto whose woody 
cylinder is dissected into separate strands by wide, high multiseriate rays. c. 
Transverse section of stem of woody or ‘ transitional ’ herb showing ‘ confronting * 
and ‘ flanking ’ parenchyma — the condition which is emphasized by Jeffrey and 
Torrey in their theory of the origin of the herbaceous type. D. Transverse 
section of slender, herbaceous stem which is devoid of ‘foliar storage rays’. 
E. Ditto whose stele is dissected into a series of discrete woody strands 
(Sinnott and Bailey) 530 
1. Verrucaria calciseda, showing gonidial groups encircled by hyphae, and hyphae 
crossing from group to group. 2. Verrucaria calciseda. Simple inflations of 
hyphae (Fry) 545 
3. Verrucaria calciseda. Young apothecium (longitudinal section). 4. Lecidea 
immersa. Old apothecial pit being recolonized by gonidia and hyphae (Fry) . 546 
Lecidea immersa. Young apothecium (longitudinal section) (Fry) . . . 547 
Lichen ‘X’. Inflated hyphae (Fry) 549 
7. Lichen ‘X’. Sperm ogonium. 8. Lichen ‘ X’. Pycnidia with macrospore 
( Fry ) • 550 
Aspicilia calcarea, showing apothecium and large clusters of inflated cells (Fry) . 555 
Influence of change of temperature upon permeability to K 2 Cr 2 0 7 (Williams) . 565 
K salts (Williams) 567 
Na salts (Williams) 568 
