442 THE ORIGIN OF THE BRITISH FLORA. 
Modification. Mode of Dispersal. 
ce of minute seeds Readily moved by accidents of 
(Heaths, Rushes, Saxifrages, all sorts. 
Caryophyllacex, &c.). 
Abundance of large edible seeds Eaten or dropped by birds; most 
(Oak, Pine. Hornbeam, Ivy, are destroyed, but some are 
&e.). transported uninjured. 
Winged seeds (many Composites, Transported by wind. 
illows, &c.). 
Winged seeds with lax ome 
(Willow-herbs, Willows, Bul- 
rush, é¢,). + Cling to feathers or fur. 
Burrs and hooked seeds. | 
Floating seeds. Transported by water. 
t-leaved submerged 
Collapse and cling when removed 
from the water; stems fragile, 
and broken pieces grow. Car- 
ried on legs of mammals or of 
wading birds. 
water 
plants (Water Crowfoot, Water 
Milfoil, &e.). 
ood being rejected owing to excessive or injudicious feeding, whic 
pliocene period Britain seems to have taken somewhat of its present 
form, though the climate was still warmer than now; but it is only 
in the latest pliocene deposits that a copious land-flora is found, 
and, as far as the plants now inhabiting Britain are concerned, 
history begins with the Cromer Forest-bed, which consists of a 
having probably not yet been cut. e climate was a temperate 
ne submergence of perhaps fifty feet then took place. After 
this followed a colder period, with arctic . en commence 
