230 BRITISH PLANTS 
II. Herbaceous Associations. 
1. Dry or moist soils : 
(a) Lowland and Sub-Alpine Pastures 
(p. 258). 
(6) Limestone-Pasture (p. 259). 
(c) Alpine Pasture (p. 259). 
2. Wet soils, with accumulation of organic 
matter : 
Marsh (p. 244) and Reed-Swamp (p. 241). 
3. In water : 
Vegetation of Lakes, Streams, and Ditches 
in the lowlands (p. 234). 
B. Associations with a Water-Supply Poor in Mineral 
Food. 
I. Forest. 
Coniferous Woods.—Soils poor, chiefly sand 
and peat, liable to excessive moisture and 
to drought (p. 273). 
II. Herbaceous Associations. 
1. Dry soils : 
Vegetation of Fixed Sand-dunes (p. 282). 
2. Moist soils more or less mixed with peaty 
humus : 
(a) Grass - Heath. — Grassy turf, with 
heath-plants ; moisture variable, 
water retained in soil by peat, but 
periods of drought occur (p. 250). 
(>) Calluna-Heath.—Soil poor, with mix- 
ture of peaty humus; drainage 
good, and moisture not well main- 
tained, therefore liable to drought 
(p. 252). 
3. Substratum of continuous peat ; moisture 
variable according to depth of peat and 
rate of drainage. 
(a) Heather-Moor.—On sloping ground ; 
soil poor and covered with a felted 
layer of peat (p. 252). 
