PLANT ASSOCIATIONS 231 
(5) Erica Tetralix - Moor.— Peat deeper 
and more continually moist than 
(a) (p. 253). 
(c) Molinia czrulea-Bog.—On_ badly- 
drained peat (p. 251). 
(d) Eriophorum-Moor.—On deep peat, 
rainfall high, moisture excessive, 
and drainage slow (p. 254). 
(e) Myrica-Bog (p. 253). 
(f) Sphagnum-Bog (p. 253). 
(g) Vaecinium-Moor.—In alpine zone, 
replacing heather-moor, Erio- 
phorum-moor, and_ grass-heath 
(p. 255). 
4. Wet soils with much organic matter : 
Juncus and Carex-Bogs (p. 246). 
5. In water : 
Vegetation of Highland Lochs and Moor- 
pools (p. 238). 
C. Associations with Salt-Water. 
1. Dry soils : 
(a) Sand-dune Ridges (p. 281). 
(o) Rocks and Cliffs (p. 283). 
2. Wet soils : 
Salt-Marshes and Estuarine Marshes (p. 278). 
3. In water : 
Maritime Aquatic Vegetation (p. 275). 
BIBLIOGRAPHY. 
General Treatises : 
Schimper, A. F. W. : “‘ Plant Geography upon a Physiological Basis.” 
Clarendon Press, Oxford. 
Warming, E.: ‘‘ Ecology of Plants.’’ Clarendon Press, Oxford. 
Ecological Distribution : 
Lewis, F. J.: “Geographical Distribution of Vegetation of the 
Basins of the Rivers Eden, Tees, Wear, and Tyne.” Geograph- 
ical Journal, vols. xxiii. and xxiv., 1904. 
Moss, C. E.: ‘‘ Geographical Distribution of Vegetation in Somer- 
set,’ issued as a separate memoir by the Royal Geographical 
Society. Edward Stanford, London, 1907. 
