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FURTHER OBSERVATIONS ON THE HEATH 
ASSOCIATION ON HINDHEAD COMMON. 
Bv F. E. Fritsch, D.Sc., Ph.D., and E. J. Salisbury, D.Sc. 
[With Plate I and One Figure in the text] . 
I ^HE present paper is a continuation of observations on the 
heath association on Hindhead Common made by staff and 
students of the Botanical Department, East London College and, in 
order to facilitate comprehension of the subsequent matter, a brief 
recapitulation of the main topographical features may first be given 
(see 3). The main area consists of a “central ridge” gradually 
sloping down from the north-east and bounded by two converging 
valleys (A and B in Fig. 1) meeting at the south-western end. From 
this point the valley A runs onward in a south-westerly direction 
gradually passing over into that leading down to Shottermill, so 
that the main valley-system is more or less in the form of a Y ; from 
the main stem of the Y two further south-easterly valleys (C and D) 
arise, approximately at distances of 330 and 730 yards respectively 
from the point of junction of A and B. The tops of the ridges are 
mainly occupied by tall Calluna and Ulex nanus (CU facies), whilst 
the slopes, which appear to have been subject to more recent fires, 
bear a mixed vegetation composed chiefly of low Calluna, Ultx nanus 
and Erica cinerea (CUE facies). 
As we are largely concerned with colonisation and rejuvenation 
(i.e., sprouting of stools after a fire) on the different burnt areas, their 
distribution may be enumerated. In this connection we shall 
represent each by the symbol F, followed by a numeral indicating 
