Index. 
IX 
Figures. page 
3,4. 3. Growth of Botrytis cinerea on potato agar at laboratory temperature and in 
refrigerator. 4. Growth of Fusarium sp. on ditto at laboratory temperature and 
in refrigerator (Brown) 273 
1. Zygnema stellinum, showing scalariform type of conjugation (Smith) . . . 302 
2. a, young zygospore of Z. stellinum, showing four chloroplasts and fusion nucleus in 
centre of spore. b t young azygospore, ovoid, with only two chloroplasts. c, mature 
zygospore, showing sculpturing of the mesosporium ; the four chloroplasts 
remaining distinct (Smith) 303 
1. Map of Perthshire, showing Dr. White’s botanical districts (Matthews) . . 322 
2. Curves for Highland and Lowland species in Perthshire (Matthews) . . ‘ .326 
1-4. Helobieae (Arber) 331 
5-7. Palmae and Cyclanthaceae (Arber) 334 
8-12. Araceae (Arber) 336 
13-16. Liliaceae (Arber) 338 
17-21. Amaryllidaceae, Dioscoreaceae, Iridaceae (Arber) ...... 341 
22-29. Dicotyledons (Arber) 344 
1. Curves showing dry weights of wheat plants at three stages of growth in heavy and 
light soils, with different methods of watering (Kharak Singh) . . . 357 
2. Set A. Wheat plants on June 15, i. e. 55 days after sowing (Kharak Singh) . 358 
3. Set B. Wheat plants on July 14, i. e. 45 days after sowing (Kharak Singh) . 359 
1. Type of paper atmometer used in transpiration experiments (Knight) . . . 366 
2. Recording porometer (Knight) 367 
3. Showing graphs of evaporation, transpiration rate, relative transpiration, and 
stomatal aperture, during the early stages of wilting (Knight) .... 369 
1,2. 1. Distribution of stomata on the upper surface of leaves. 2. Detail of stomata 
and non-stomata-bearing cuticle (Chandler) ....... 386 
3. Cones. ( a ) and (b), two aspects of a cone of Sequoia Couttsiae ; ( V ), S. semper- 
virens ; (d), Athrotaxis laxifolia (Chandler) . . . . . . . 388 
4, 5. 4. Cone-'scales. ( a ), S. Couttsiae, upper surface, (r), Ditto, lower surface. ( b ), 
Athrotaxis laxifolia, upper surface. ( d ), Ditto, lower surface. 5. Seeds. ( a ), 
S. Couttsiae. (£), Athrotaxis selaginoides (Chandler) 389 
1. Sketch-map of Blakeney Point on a scale of 3 inches to 1 mile (1 : 21 120) 
(Salisbury) 393 
2. Root systems of Cerastium semidecandrum, Phleum arenarium, and Draba verna, 
three dune ephemerals, showing their shallow character (Salisbury) . . 402 
3. Root systems of Myosotis collina and a seedling of Senecio jacobaea (Salisbury) . 403 
4. Graph showing the relation between organic content and carbonates in dunes of 
varying ages as indicated by the letters a to j (Salisbury) .... 414 
5. Graph showing relation between percentage carbonate content of the soil of the 
crest of shingle laterals and their age as indicated by their positions in the shingle 
system (Salisbury) 415 
1. A, B. Two specimens of Botrychium simplex, Hitchcock. c. Leaf segment 
showing venation (Campbell) 442 
2. a. Median section of nearly ripe antheridium. B, c. Surface view of two antheridia 
showing the operculum, d. Median section of archegonium before the separation 
of the central and neck canal-cells. E. Young archegonium showing irregular 
division in the cap-cell. F. Archegonium in which the egg-cell is much com- 
pressed, and the lower part of the canal-cell is enlarged so as to resemble an egg- 
cell (Campbell) 444 
3. A. Fertilized archegonium containing'a unicellular embryo, b. Two-celled embryo. 
c. Two-celled embryo showing oblique basal wall. D. Three longitudinal 
sections of a four-celled embryo showing no vertical divisions, e. Longitudinal 
section of three-celled embryo (Campbell) 446 
4. A. Three longitudinal divisions of a young embryo showing a pretty regular quadrant 
division, b. Two somewhat oblique sections of an embryo of about ten cells 
(Campbell) . 447 
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