X 
Index. 
Figures. 
1. 
2 . 
4 , 5 * 
6 . 
3 - 
4 * 
5 - 
6 . 
i. 
I, 2. 
3 » 4 - 
1 - 3 * 
4-6. 
1. 
Antherozoids shortly after having emerged from the antheridium (Rickett) . 
Archegonium surrounded by involucre and containing an egg in the fourth phase of 
fertilization. Thirty-six hours after flooding (Rickett) ..... 
Archegonium containing a four-celled embryo. Eighty-four hours after flooding 
(Rickett) . 
Rate of growth of bean roots in volume (Pearsall) . . . . ? . 
Growth of stem and root (Series III) in peas at 25° C. (Pearsall) 
Growth of stem and root in peas (Series IV) at 15 0 C. after appearance of secondary 
roots (Pearsall) .. 
4. Growth of stem and root (Series V) in peas after appearance of secondary 
roots. Stem weight reduced by one-half. 5. Relation of plant members 
(1 earsall) ... 
Stem length, flowering and fruiting curves in Egyptian cotton (from the data of 
Balls and Holton), giving average increase per plant per day (Pearsall) 
Distribution of 266 plants of the British Flora confined to England and Wales 
(Matthews) .. 
Distribution of 1 29 rare ‘ English ’ species (Matthews) 
Distribution of 37 ‘ Ouse ’ species (Matthews) 
Distribution of 29 ‘ Thames’ species (Matthews) 
Distribution of 39 ‘ Channel ’ species (Matthews) 
Distribution of 41 ‘ Peninsula’ species (Matthews) 
Series of radial longitudinal sections through upper ends of stems at various intervals 
after inoculation, illustrating stages in gall formation: a after 6 days, R after 
9 days, c after 15 days, D after 4 months, e after 5J months (Robinson and 
Walk den). 
2, 3. 2. Series of radial longitudinal sections through lower ends of inoculated cuttings 
at intervals: A of 6 days, B of 12 days, c of 15 days, and d of 18 days after 
inoculation. 3. Ditto through lower ends of control, inoculated cuttings at 
intervals : a of 6 days, B of 12 days, C of 18 days, and n of 21 days after planting 
(Robinson and Walkden). 
4. A. Phyllotaxy diagram of the shoot of C. frutescens shown in PI. V, Fig. 10. 
B. Diagrammatic representation of the presumed path of the needle shown in 
relation to the longitudinal view of the apical region of the same shoot (Robin¬ 
son and Walkden). 
Median longitudinal section of the flower-protuberance of Cephalaria elata (from 
a microphotograph). 2. Ditto in a more developed stage (Szab6) 
Theoretical ground-plan of the junction of the vascular bundles of a tetracyclic 
tetramerous epigynous flower. 4. Ground-plan of the flower and the junction of 
the vascular bundles in the genus Cephalaria (Szabo) ..... 
A sketch of the longitudinal section of the flower of Cephalaria, showing the union 
of the vascular bundles (Szabo) ......... 
Titration curve of boiled tap-water with carbonic acid of pH 5 + c.05 (E. P. Smith) 
1. Part of pinna of Loxsomopsis notabilis seen from below, showing two pinnules 
each with a sorus arising from an anadromous van. 2. Bases of hairs of 
Loxsomopsis notabilis of different structure, in juxtaposition on surface of 
rhizome. 3. Soft hair from leaf; stiff bristle with enlarged base from the rhizome 
(Bower). 
Sporangium of Loxsomopsis notabilis, presenting its distal face, in the middle of 
which one cell appears indurated. 5. Sporangium with stalk of several rows 
probably as in Dicksonia, but short conical in form as in Loxsoma. 6. Loxso¬ 
mopsis notabilis. Sporangium attached to the receptacle, with two hairs (Bower) 
Graphs of actual yield values of soy bean tops and roots grown in Tottingham’s 
solution Tj^Cg (series C), and in the ammonium-sulphate modification of this 
solution (series D), supplied with varying amounts of iron in the form of ferric 
phosphate (Jones and Shive). 
Ditto supplied with the varying amounts of iron in the form of ferrous sulphate 
(Jones and Shive). 
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33 1 
332 
345 
35 1 
352 
363 
364 
2. 
