744 
VEGETATION SURVEY OF NORFOLK. 
with the sands and light loams of the former district. Lying 
apart, several miles to the south, it is not included in the 
expression “ the area.” Sheets 37 and 50 are continuous with 
51, and afforded special problems by the junction of heavy and 
light lands. In the meanwhile an enquiry into common lands 
undertaken by W G. C. (Trans., Vol. IX., p. 52) has taken 
us individually or jointly to practically all the accessible waste 
lands of the county, our knowledge of the natural vegetation 
being further strengthened by an intensive study of Flordon 
Common. (Ibid, p. 170.) 
The boulder clay area consists almost entirely of arable fields 
and permanent pastures. The glacial loams, sands and gravels 
furnish greater diversity ; there are heaths, heath pastures, 
woodlands (often on ridges or on the slopes of tablelands where 
the soil is not worth cultivating) and fields of mixed soils, the 
glacial beds from which they are derived being so intermixed 
as to show marked variations even in individual fields, as is 
well known to agriculturists. 
The river Wensum enters the district at Lyng and leaves it 
just below Drayton railway station, a distance of about fourteen 
miles, following the serpentine windings of the stream, there 
being a fall from 52 to 19 ft., or 2 ft. 4 in. per mile. The river 
is bordered by alluvium averaging about a quarter of a mile in 
width and usually consisting of drained pasture, the boundary 
lines of which are, for the most part, sharply defined, the uplands 
rising gradually from its verge, though in places, as at Wrongs 
Covert, Weston, and at Morton Hall, there are almost cliff-like 
escarpments, the latter furnishing one of the most beautiful 
views in the county. Several minor streams flow in an easterly 
direction to the Yare, Bure, Wensum, or the Tas. At Weston 
two small tributaries of the Wensum are utilised for trout 
hatcheries. The average rainfall is about 25 inches. Altitudes 
range from 200 feet just west of Sandy Lane, East Tuddenham, 
and Telegraph Hill, Honingham, to 14 feet near Crostwick ford. 
The number of enclosures of all kinds surveyed was 3,240, 
giving an average of 10'6 acres. On light lands the larger 
fields are from thirty to fifty acres in extent, sometimes more. 
