Index . 
IX 
Figures. 
PAGE 
6. Ditto. Empirical diagrams showing arrangement of bracts and perianth 
segments in abnormal flowers (Salisbury) 54 
7. Ditto. Meristic variation in androecium (Salisbury) . . . 55 
8. Fused carpel and stamen of Eranthis hyemalis (a) and branched carpel 
of Helleborus niger (b) (Salisbury) . .... 56 
9. Eranthis hyemalis. Variation in bracts (Salisbury) ... 58 
10. Ficaria verna. Empirical diagrams showing arrangement of the 
perianth segments and stamens (Salisbury) 62 
11. a and B, branched stamens of Ficaria verna; C, petaloid stamen; 
D, partially coloured sepal ; e 3 sepal with lobed lamina ; F, Anemone 
nemorosa, branched stamen ; G, bilobed petal of Ficaria verna ; 
h-j, variation in the sepals of F. verna (Salisbury) ... 63 
12. Ficaria verna. Variation * curve ’ for androecium (Salisbury) . . 64 
13. Ditto. Variation ‘ curve * for gynaeceum (Salisbury) ... 65 
14. Anemone nemorosa. Variation ‘ curve ’ for androecium (Salisbury) 68 
15. Ditto. Variation £ curve ’ for gynaeceum (Salisbury) ... 68 
16. A, diagram of perianth of A. nemorosa ; B, floral diagram of Aconitum 
napellus ; c, branched stamen of Aquilegia sp. ; d and E, branched 
stamens of Delphinium sp. ; F, diagram of perianth of Ranunculus 
bulbosus (Salisbury) 69 
17. Anemone napellus. Variation ‘ curve ’ for androecium (Salisbury) . 70 
18. Variation ‘curve’ for the androecium of Aconitum Lycoctonum 
(Salisbury) 70 
19. Variation ‘ curve ’ for the gynaeceum of Aquilegia sp. (Salisbury) . 72 
20. Stamens of Ranunculus auricomus, var. depauperata, developed in place 
of the petals (Salisbury) 73 
1. Diagram to show the fossil in plan and elevation (Sahni) ... 85 
2. Ditto illustrating the extent to which the intruded roots distort the 
normal clepsydroid shape of the leaf-traces (Sahni) ... 87 
1. Euglena deseSj showing changes in shape occurring in one individual 
during several minutes’ observation (Bracher) .... 95 
2. E. deses. Diurnal differences in appearance. (1) Early morning 
(actively moving) ; (2) midday (lying still on mud surface) ; (3) night 
(rounded off) (Bracher) 96 
3. Apparatus for producing tidal effect over area of Avon mud (Bracher) 97 
4. Graph representing the intensity of greenness on the mud under normal 
conditions with reference to the periods of high water and of dark- 
ness (Bracher) 98 
5. A graph drawn to illustrate the behaviour of E. deses when removed 
from the influence of the tide (Bracher) 100 
6. (1) Position of Euglenae at commencement of experiment : a, stiff mud ; 
b, wet mud ; c, mud covered by water ; u, water only. ( 2_) Posi- 
tion of Euglenae after five days’ illumination from one side 
(Bracher) 102 
7. E. deses. 1-5, changes in shape of one individual when warmed from 
1-5° C. to 16 0 C. (Bracher) 103 
8. Graph showing the time taken for Euglena deses to respond to the 
stimulus of light at different temperatures (Bracher) . . .104 
9. Showing position taken up by Euglenae on the mud during rain 
(Bracher) . 105 
1-8. Archesporial divisions. 9-12. Last archesporial division from meta- 
phase. 13. Rest between last archesporial division and heterotype 
prophase. 14. Intermediate stage between the telophase of the last 
archesporial division and the heterotype prophase. 15-27. Hetero- 
type division. 28-34. Homotype division. 35. Resting stage of 
tetrad (Digby) ........ facing 138 
