X 
Index . 
Figures. 
3 i- 
32. 
33 - 
34 * 
35 - 
3 < 5 . 
37 - 
38 . 
39 - 
40. 
42. 
43 . 
3 - 
4 * 
5 - 
2. 
3 ? 4 - 
2. 
2. 
3 - 
4. 
3 * 
PAGE 
5 . Vertical sections of young sori of Pteris serrulata (Bower) . 44 
Vertical section of advanced sorus of Pteris cretica (Bower) . . 44 
a-c. Successively older sori of Pteris quadriaurita, seen in vertical 
section (Bower).45 
Vertical section of the mature sorus of Pteris podophylla (Bower) . 46 
a-c . Successive sections of a pinna of Acrostichum praestantissimum, 
from the apex downwards, showing widening of the Pterid sorus 
(Bower).47 
Margin of a fertile pinna of Acrostichum praestantissimum, showing in 
surface view the indusium, receptacle, and soral area (Bower) . 48 
a. Pinnule of Dennstaedtia dissecta seen in surface view, showing 
marginal sori on the apex of the anadromic branches of the veins. 
b. Sorus very young, cut in vertical section, showing the marginal 
receptacle and superficial indusial flaps, c. Mature sorus in vertical 
section (Bower).52 
Mature sorus of Hypolepis nigrescens cut vertically, showing its mixed 
character and the absence of the inner indusium (Bower) . . 52 
Pinnule of Hypolepis repens seen in surface view (Bower) . . 53 
a. Young sorus of Hypolepis repens cut vertically, b. Small part of 
the soral surface including the vestigial indusium, more highly 
magnified (Bower).53 
a. Sorus of Acrophorus nodosus in surface view. b. Pinnule of the 
same, showing the vein continued beyond the sorus (Bower) . 55 
Transverse section of the stock of Monachosorum subdigitatum 
(Bower).57 
Pinnule of Monachosorum subdigitatum in surface view (Bower) . 57 
Apparatus for determining conductivity in the pulvinus of Mimosa 
pudica (Blackman and Paine).71 
Graph showing effect of contraction on the rate of exosmosis (Black¬ 
man and Paine).76 
Ditto showing autonomous contractions (Blackman and Paine) . 78 
Ditto showing effect of light on protoplasmic permeability (Blackman 
and Paine).81 
Ditto showing effect of temperature on rate of exosmosis (Blackman 
and Paine) .... 
Acorus calamus, L. (Arber) 
Tamus communis, L. (Arber) . 
Thalictrum flavum, L. (Arber) 
• 83 
. 87 
. 87 
. 89 
Escape of the sporangiospores (Weston) ... . . 160 
Zoospores. Diagrams showing the characteristic shape (Weston) . 163 
General plan of apparatus (Parr) .183 
Spectral energy graphs for itheisingie'glower Nernst lamp and the 
200-watt nitrogen-filled tungsten Mazda lamp (Parr) . . • J 94 
Graphs in which abscissae represent the presentation time of Pilobolus 
and ordinates the energy values of the spectral regions to which the 
plant was exposed (Parr) . . . . . . . *195 
Graphs showing presentation times on Pilobolus in relation to frequency 
of light waves (Parr) ......... 196 
Cells taken from mature leaf mounted entire in water and viewed from 
the surface (Rivett). . . 208 
A. Two cells with oil-bodies in surface view. B. The same irrigated 
with alcohol (Rivett). .210 
Mature cells in longitudinal section from base of full-grown leaf 
(Rivett) 
212 
