ОЕ SOME NORTH WORCESTERSHIRE POOLS. 425 
branches. It is deep and free from weeds. It receives its water from 
two small upper pools and from a small stream coming from the Permian 
and Old Red Sandstone rocks of Trimpley. It receives а considerable 
amount of house-drainage. Grass-land surrounds it. 
1. Stanklin Pool. 
Area eleven acres. The upper end is much silted, Турйа angustifolia 
and Arundo Phragmites occur plentifully round the sides. Banks of Pota- 
mogeton lucens and Polygonum amphibium are found in the middle. An 
extraordinarily abundant formation of Chara aspera covers the bottom of 
the pool. Most of the pool is shallow, but at the lower end it reaches 
a depth of ten or twelve feet. The water 13 surrounded by trees and 
pasture-land. The water-supply is from bottom springs and from drainage 
from one or two very small pools higher up. These latter are much 
contaminated, but their drainage filters through the large bog at the upper 
end of tlie pool. 
8. Harvington Hall Moat. 
Area about one acre. It is the old moat of Harvington Hall. It is 
fairly deep in one part, but about one-third of the original area is 
completely silted-up. In this mud Typha angustifolia and Acorus Calamus 
abound. The water is much contaminated by house-drainage. A small 
stream supplies the moat. 
9. Wilden Pool. 
Area about nine acres. The water is derived from the River Stour. The 
pool is fairly deep and comparatively free from weeds. A little Potamogeton 
natans and Myriophyllum occurs. 
The pools may be classified as follows :— 
A. Pools through which a considerable stream Hows: 
1. Hurcott Pool. 
2. Podmore Pool. 
3. Broadwaters Pool. 
4. Island Pool. 
В. Pools supplied by bottom springs or by small streams from adjacent 
springs : 
5. Spring Grove Upper Pool. 
6. Spring Grove Lower Pool. 
7. Stanklin Pool. 
8. Harvington Hall Moat. 
С. Pool supplied by overflow from River Stour : 
9. Wilden Pool. 
