Index. 
xv 
Figures. 
i. 
2 . 
3 - 
\-6. 
7- 
8 . 
9 - 
12 . 
13 - 
14 . 
15 - 
16 . 
] 7* 
3 - 
4 - 
5 - 
2 
3 
4 
5 
6 
7 
PAGE 
a-c . Hemitricotylous seedlings, showing three stages in the division of 
the abnormal cotyledon (Holden and Bexon) . . . .515 
a-f. Hemitricotyl, Type a (Holden and Bexon) . . . .515 
a-e. Ditto. Diagrams showing the characteristic features of this type 
(Holden and Bexon) .516 
Hemitricotyl, Type / 3 . Transverse sections of petiole, near apex of 
hypocotyl, and near base of hypocotyl (Holden and Bexon) . 516 
a-e. Ditto. Diagrams showing the initiation of triarchy and its 
reduction to diarchy by fusion (Holden and Bexon) . . . 5 1 7 
Tricotyl. Transverse section near apex of hypocotyl (Holden and 
Bexon). 517 
Ditto. Transverse section at base of hypocotyl (Holden and 
Bexon). 517 
a-f. Tricotyl showing reduction from triarchy to diarchy by fusion 
(Holden and Bexon) .518 
a-c. Tricotyl showing persistent triarchy (Holden and Bexon) . 519 
a-d. Tricotyl, Type a (Holden and Bexon).519 
a-c. Tetracotylous and hemitetracotylous seedlings (Holden and 
Bexon).521 
a-e. Tetracotyl showing reduction from tetrarchy to diarchy by fusion 
(Holden an^ Bexon).521 
a-e . Tetracotyl showing reduction from tetrarchy to triarchy by fusion 
(Holden and Bexon).521 
a-c. Tetracotyl showing persistent tetrarchy (Holden and Bexon) . 522 
a-f. Tetracotyl showing reduction from tetrarchy to triarchy by loss of 
one xylem pole, and from triarchy to diarchy at a later stage by 
fusion (Holden and Bexon) ..522 
Sketch-map of Somerset to show the distribution of Sphagna 
(Watson) •.536 
Sphagnum subnitens, R. and W. A. Diagrammatic sketch of the 
fertile plant. B. Portion of the plant showing two fascicles or 
groups of branches. C. Stem-leaf, indicating the border of narrow 
cells becoming broader below. D. Stem-leaf, showing undulations 
and the margin inrolled at apex. e. Cells from the middle of the 
stem-leaf. F. Cells from the margin of the stem-leaf. G. Branch- 
leaves. H. Outer surface of branch-leaf showing fibres and pores. 
I. Inner surface of branch-leaf. J. Portion of section of branch-leaf 
showing two hyaline and one chlorophyllous cell (Watson) . . 539 
A-D, F, G, M. Sphagnum subnitens. e. S. rubellum. H, I. S. inundatum. 
J. S. rufescens. K, o. S. subsecundum. N. S. cymbifolium. P. S. 
papillosum (Watson) .540 
A-e. Sphagnum cuspidatum var. plumosum. F, G. S. pulchrum. H, I. 
S. compactum. J-m. S. medium (Watson) .542 
A-c. Sphagnum recurvum. D. S. amblyphyllum (= S. recurvum var. 
amblyphyllum. E. S. molluscum. f-h. S. inundatum, i-n. S. 
cymbifolium. o. S. imbricatum. P. S. cuspidatum. R, T, v. S. 
obesum. w. S. compactum. X, Y. S. rufescens (Watson) . . 543 
Anatomy of Hazel-wood with reference to Conductivity of Water 
(Holmes) .554 
st >> n st 555 
>» >> » n 559 
i> >< n >t ss 56 ° 
ts }> ts st ts 5^ r 
ft SS St ft St 
ft >> st tt st 563 
