899 
Woods of North-East Kent. 
the Chalk, and is completely replaced on the Clay with Flints by Viola 
Riviniana. Similarly Hypericum hirsutum is replaced by Hypericum per¬ 
foratum on the Clay. These plants exhibit the distinctions which Kerner 
has shown to exist between calcicolous and non-calcicolous species. Both 
Viola hirta and Hypericum hirsutum possess pubescent bluish-green leaves, 
whereas in Viola Riviniana and Hypericum perforatum the leaves approach 
grass-green and are glabrous; the flowers of the calcicolous species are 
somewhat lighter in hue than those found on the non-calcareous soils. 
The two other species of Hypericum found commonly in this neighbour¬ 
hood also show a decided preference for certain formations. Hypericum 
humifusum , although occurring occasionally on the Clay with Flints and 
Alluvium, is abundant on the Thanet Sand; Hypericumpulchrum , which is 
occasionally found on all the different soils, occurs in abundance on the 
London Clay. 
A general consideration of the plant distribution in the districts investi¬ 
gated leads to the conclusion that two main types of vegetation can be 
distinguished:— 
(a) That found on the Chalk and Clay with Flints. 
(b) That found on the Tertiary formations. 
The inclusion of the Chalk and Clay with Flints under one heading 
may at first appear remarkable, but a consideration of the vegetation already 
described on these deposits will justify this conclusion. Although the soils 
of the two formations differ greatly in chemical composition, many points of 
agreement are found in the respective floras. 
It might be expected that the vegetation of the two clay soils found in 
the Faversham district would show considerable agreement. It has been 
proved, however, that this -is not the case. In fact, the flora found on the 
Clay with Flints more nearly resembles that of the Chalk than that occurring 
on the London Clay. 
Although the Tertiary soils range from light sands to heavy clays, 
a considerable number of species occur throughout the four formations. 
These are frequently absent from or only occasionally found on the Chalk 
and Clay with Flints. The following lists will emphasize the difference 
between the two types. 
(a) Plants found either on the Chalk or Clay with Flints, and absent 
from or only occasionally found on the Tertiary deposits 
Viola hirta , L. Linum catharticum , L. 1 
Hypericum hirsutum , L. Euonymus europaeus , L. 
Helianthemum Chamaecistus , Mill. Cornus sanguinea , L. 
Reseda lutea , L. Viburnum Lantana, L. 
