TRANSACTIONS OF SECTION K. tis 
Norfolk. The area chosen for the survey has been visited by parties from the 
Cambridge Botany School on many occasions during the last six years. It lies 
on the south-eastern shore of the Wash. 
The principal feature of the area is a sandy salt marsh, with considerable 
quantities of Statice Limonium, *S, bineurosum, *S. bellidifolium, *Salicornia 
perennis var. radicans, S. disarticulata, Armeria maritima, Atriplex portula- 
coides, and other halophytes. Fixed dunes with Ammophila arenaria limit the 
salt marsh on three sides; and embryonic dunes with Agropyron juncewm and 
Elymus arenarius occur. Along the seaward side of the area is a system of 
shingle banks, with well-developed lateral banks and apposition banks. The 
lateral banks are characterised by *Suada fruticosa and *#'rankenia levis. The 
species here preceded by an asterisk are Mediterranean plants which in this 
locality reach their northern limit. A considerable extent of bare sand alsu 
occurs, and this is locally beginning to show signs of being colonised by Suceda 
maritima. The sea enters the salt marsh through a small break in the shingle 
bank, At ordinary high tides most of the bare sands are covered, but in the 
salt marsh itself only the channels are filled. 
The members of the party numbered six. In June they were able to spend 
a few days at Holme, and they commenced work on a fairly large scale, and 
the intention is to carry on the work later in the year and in succeeding years. 
The mapping out of the area was begun by chaining out a base-line from 
ene end to the other. It was seven furlongs in length. At each furlong 
offsets were chained out, on the landward side to the edge of the cultivated 
land and on the seaward side to the low-water line. The filling in of the 
detail in the areas between the offsets was commenced with the plain table on 
a scale of eighty inches to the mile (1: 792). On this scale, neglecting the bare 
sand towards the even tide-line, the map commenced consists of fourteen sheets, 
each about ten inches square. On these sheets, of which only one is as yet 
completed, the different plant associations and societies are shown in different 
columns. In addition to the mapping, levels were taken at most of the furlong 
points on the base-line, the level being brought in from a beach bank in Holme. 
HKlevations have also been plotted along two of the offset lines from the edge of 
cultivation to the low-water mark. 
In order to complete the map and the series of elevations across both ends 
of the area, across at each furlong stake and along the base-line, arrangements 
were made for a party to go to Holme during the present month (September). 
Work on the analysis of the soil and soil-water were then to be commenced. 
It is hoped that by these means light may be thrown on some of the problems of 
plant distribution which are presented by the salt marsh, the sand dunes, and 
the shingle banks. Looking still further ahead, a detailed record of the 
succession of changes occurring over the area will also be obtained. 
3. On the Distribution of Suseda fruticosa and its réle in the Stabilising 
of Active Shingle. By Professor F. W. Otiver, F.R.S. 
Shingle beaches exposed to the sea are liable to landward travel when very 
high tides are accompanied by onshore gales. To some extent all shingle 
plants retard or modify this movement, but Suceda fruticosa, from its shrubby 
habit of growth and high capacity of rejuvenescence, is the most effective 
stabiliser of all British shingle plants. 
The present communication dealt with the conditions of establishment of 
this plant, and with the manner in which it promotes the fixation of active 
shingle. 
4. The Influence of River Development on Plant Distribution. 
By A. R. Horwoop. 
Little attention has been drawn to the influence of rivers on plant dispersal. 
Primarily plants depend upon soil, altitude, and climate for their distribu- 
tion or occurrence in natural plant formations. 
Now, in an area where the ‘solid’ rocks are entirely or largely covered by 
