relation to the Soils on which they groiv. II. 99 
Ramex Acetosella. Only seen on ‘ bake \ (Characteristic of acid sandy 
soils.) 
Rumex crispus. Most frequent on chalky soils, but often seen on clay 
and other types of land. Occasionally dominant on sand and red land. 
Euphorbiaceae. Euphorbia exigaa. Chiefly on clay, but frequent on 
other soils. Never dominant, but occasionally sub-dominant on clay. 
Euphorbia Helioscopia. Fairly well distributed, but most frequent on 
chalky soils and loam. Never dominant, usually only occasional or scarce. 
Liliaceae. Ornithogalum pyrenaicum . Characteristic of heavy clay 
soils in the Bath district. Rare. 
Gramineae. Alopecurus agrestis. Occurred on various types of soil. 
Occasionally dominant on chalk. 
Arrhenatherum avenaceum var. tuberosum. Distributed as to soil. 
Once dominant on ‘ black gravel 
Bromus arvensis and B. sterilis. Very seldom seen, then only on 
chalk. 
Lolium perenne. Only on chalk and clay. Never dominant. 
Poa^ annua. Chiefly on clay, but also found on other soils. Never 
dominant. 
Poa pratensis. Only recorded from chalk. Once dominant. 
Poa trivialis. Universal in distribution. Once dominant on clay. 
Triticum repens. Universal in distribution. Dominant on heavy land. 
Equisetaceae. Equisetum arvense. Universally distributed as to soil, 
but not very frequent in occurrence. Once dominant on clay. 
Analyses of the data have been made showing the distribution of 
the various weeds on the different soils. It must be remembered that 
a weed that is ‘ absent ’ from any particular soil may occur in isolated 
instances in that very habitat, in which case it is usually only occasional 
or very rare in distribution. 
A. Clay and Heavy Brashy Soils. 
In the districts round Inglescombe and Inglesbatch, near Bath, the 
land is of an exceptionally heavy nature, being a very sticky clay, which 
needs special care and methods to farm it properly. During the hot 
weather it bakes very badly and opens out into deep cracks. This soil 
is derived from three geological formations which crop out in succession 
up the hillsides, and it is characteristically calcareous on account of the 
limestone which occurs with it, in contradistinction to the non-calcareous 
clays worked in Bedfordshire. 
1. Inferior Oolite; soil very reddish in colour and generally brashy 
in nature. Contains much limestone. 
H 2 
