Genus Statice as represented at Blakeney Point. I. 281 
(b) The dwarf form characteristic of stable lateral banks (pp. 240-1) (the 
typical narrow-leaved form), but which also occurs on the margin of muddy 
lows (mud plants), and of sandy-mud lows (sandy plants). 
(c) The ? hybrid form between .S', binervosa and 5 . bellidifolia (p. 245). 
The habitats of all the forms are described, and the ecological factors 
involved and their possible effects on the plants are considered. Experi- 
mental evidence is brought forward to show the temporarily stimulating 
effect of shingle on growth — the effect is due to mulch action (pp. 240-6). 
2. Glands (pp. 251-7). 
The structure, number, and distribution of the two kinds of glands 
characteristic of the order are described. The mucilage glands function in 
preventing desiccation of the apex ; the Mettenian glands (the so-called 
chalk glands) excrete water, but probably only function when the amount 
absorbed by the roots is greater than the rate of transpiration. 
Some explanation of the numerical differences which occur is given. 
3. The Seedling (pp. 257-8). 
The morphology and the seedling structure of S', binervosa is de- 
scribed ; the method of the transition from root to stem follows van 
Tieghem’s Type 3. 
4. Root (pp. 258-63 and 276-7). 
The structure of the root in all the forms, and of the plants cultivated 
from seed, is described. In S. binervosa the structure is in every way 
adapted to withstand the pressure of shingle and is admirably suited, both 
internally and externally, to life in an habitat characterized by scarcity 
of water. The root of S', bellidifolia , on the other hand, resembles that 
of many salt marsh plants, and shows none of the characters of stabilized 
shingle plants. Differences between the roots of the two species are chiefly 
seen in the following features : 
(a) The proportion and distribution of the stereome-sclerenchyma and 
sclereides. 
(b) The nature of the xylem elements. 
(c) The character of the cortex. 
The effects of the differences in the habitats of the various forms 
of S. binervosa are considered ; the chief variations occur in : 
(a) The annual growth rings. 
(b) The development of wood parenchyma. 
(< c ) The proportion of sclerenchyma and sclereides, 
(d) The size of the vessels. 
5. Stem (pp. 263-6 and 277-9). 
The stem in both species is short and subterranean ; its outstanding 
characters are the abundance of fibres in the wood and the nests of 
sclereides in the pith and cortex. The differences obtaining in thq various 
