THE OUSE AND FOSS DISTRICT. 



221 



A broad surface of undulated clayey country, underlaid by 

 Lias, sweeps round the south-west of the terrace. Through this 

 tract both the streams flow during the early part of their course, 

 and out of it rises the hill of Crayke Castle (400 feet), which, 

 like the terrace, is capped with Oolitic Sandstone. In the midst 

 of the liassic tract, about midway between the two streams, the 

 town of Easingwold is situated, and it includes several villages 

 of considerable size. The south-western half of the district 

 belongs to the Central Valley, and is populated but thinly. 

 The soil is principally sandy, and there are several carrs, and 

 plantations of fir-trees and tracts of uncultivated, boggy heather- 

 land. Of these last, Pilmoor, by the side of the railway, upon 

 the edge of the district which is nearest the Swale, and the 

 commons or ' forests ' of Stockton and Strensall are the 

 principal. Strensall Common is now drained and turned into a 

 military camp, the Aldershot of the North. The folloAving are 

 the rarer plants which grow upon these two last-mentioned 

 heaths, along with several mosses and other plants which are 

 rare in the Central Valley : 



Drosera ititermedia 

 Spergularia rubra 

 Cerastium semidecand/um 

 Radiola Alillegrana 

 Hypericum elodes 

 Trifolinm striatum 

 Oniithopjis peipusillus 

 Epilobium augustifolium 

 Feplis Portula 

 Carduus pratensis 

 Filago 7nifiima 

 /asione montana 

 Andromeda polifolia 

 Gentiana Pneu7nona?ithe 

 Cuscuta EpitJiyinuin 

 Mentha Pulegium 

 LctJina polyrrhiza 

 Scirpus acicularis 



Ariindo Calamagrostis 

 Lycopodium Selago 



,, selaginoides 



,, imindatum 



Pilularia globiilifera 

 Equisetuni hyemale 



Archidiuni phascoides 

 Dicranum spuriuni 

 Ceratodon cylindricus 

 Campytopus brevipilus 

 Bryum annotinum 



,, sanguineum 

 Bartramia arcuaia 

 Pliyscomitrium fascicula re 

 Hypnu7n elodes 



„ SCO ipio ides 



lycopodioides. 



In its course through the central valley portion of the district 

 the Foss is a slowly-flowing stream with low banks, much 



Jan. 18 



