X 
Index . 
Figures. 
page 
28. Danaea nodosa, Sm. Transverse section of the apex of a large root 
showing four equivalent initial cells (West) ..... 399 
29. Danaea alata, Sm. Longitudinal section of the apex of a large root 
showing meristematic region (West) . .... 399 
30. Marattia Cooperi, Mre. Transverse and longitudinal sections of the 
apex of a large root showing meristematic region (West) . .400 
31. Kaulfussia aesculifolia, Mre. Transverse section of the apical region 
of the rhizome, showing early origin of a root from the vascular 
meristem (West) 400 
32. Marattia Cooperi, Mre. Transverse section of a root showing a muci- 
lage canal traversing the endodermis (West) .... 403 
33. Diagrammatic transverse sections of roots of Danaea alata, Sm., 
Danaea nodosa, Sm., and Kaulfussia aesculifolia, Bl. (West) . 404 
1. Swelling of potato and carrot in distilled and in tap water (Stiles and 
Jorgensen) 419 
2. Ditto in distilled water (Stiles and Jorgensen) .... 420 
3. Swelling of different samples of carrot at different temperatures 
(Stiles and Jorgensen) 421 
4. Curves illustrating the influence of temperature on the swelling of 
potato in distilled water (Stiles and Jorgensen) . . . .422 
5. Ditto of carrot in distilled water (Stiles and Jorgensen) . .423 
6. Curves illustrating the absorption and excretion of water from potato 
in sodium chloride solutions of various concentrations (Stiles and 
Jorgensen) 425 
7. Ditto in sucrose solutions of various concentrations (Stiles and 
Jorgensen) 425 
8. Absorption and excretion of water by potato in solutions of ethyl alcohol 
of various concentrations (Stiles and Jorgensen) . . . 426 
9. Curves illustrating influence of different concentrations of sulphuric acid 
on the swelling of potato (Stiles and Jorgensen) . . . 429 
Flasks for demonstrating the heat*of respiration (Potter) . . . 436 
1-3. Equisetum debile (Kashyap) 440-2 
1. Average dry weights of ten series of barley plants grown in strong 
nutrient solutions in the presence of differing amounts of hydro- 
cyanic acid (Brenchley) 453 
2. Ditto grown in weak nutrient solutions in the presence of ditto 
(Brenchley) 453 
3. Average dry weights of eight series of barley plants grown in strong 
nutrient solutions in the presence of differing amounts of sodium 
cyanide (Brenchley) 455 
1. Diagram showing the dependence relation of secondary dormancy upon 
the conditions of oxygen and carbon dioxide concentration used dur- 
ing the primary inhibition period (Kidd and West) . . . 463 
2. Apparatus employed for testing changes in the permeability of the seed- 
coat to gases (Kidd and West) 467 
3. Ditto for comparing permeability in inhibited and non-inhibited seeds 
(Kidd and West) 469 
4. Apparatus for measuring breaking strain (Kidd and West) . . 472 
5. Complete testa of young green seed of Brassica alba (Kidd and 
West) 486 
1. A, drawing of secondary root of Pedicularis vulgaris bearing tertiary 
roots with haustoria. B, portion of secondary root showing two-lipped 
appearance of haustoria. C, drawing showing host-root entirely 
embedded in tissue of haustorium (Maybrook) .... 500 
2. A, longitudinal section of tracheidal element of xylem of Pedicularis, 
