Xlll. 
DISTRIBUTION OF PARTICULAR PLANTS. 
The following plants, which occur in this district, have been found' 
in no other part of Yorkshire. 
Clematis vitalba 
Medicago maculata 
Latbyrus latifolius 
sylvestris 
Rosa rubella 
rubiginosa 
Cornus suecica 
Centaurea jacea 
Pyrola rotundifolia 
Sedum dasypbyllum 
Arabis bispida 
Of these, Arabis hispida is supposed to be peculiar to Yorkshire; 
Cornus suecica, which flowers in Yorkshire, is also found in Northum- 
berland, but does not flower there. 
THE FOLLOWING LOCALITIES SHOULD BE VISITED. 
Hole of Horcum. — ^This is a singular basin shaped hollow, on the 
road from Pickering to Whitby. It is the head of a small valley, sud- 
denly and deeply excavated, in the moorlands, through the calcareous 
grit and lower strata. Here grows Cornus suecica. 
Whitstonclifpb. — This is a remarkable cliff three miles north of 
Thirsk, composed of oolites, gritstone and clays, whose summit is 1,178 
feet above the sea ; on the abrupt hill side which looks to the west are 
scattered rocks ; and below them a lake (Gormire) with a rude border 
of broken ground, forming a sort of underclifi*. 
Scarborough Castle Hill. — On this insulated hill of oolite and 
other subjacent rocks, is a continual efflux of water, nourishing aquatic 
plants. Mr. Bean has found a considerable number of land shells upon 
the narrow surface, here exposed to the sea air, though raised above the 
water about 250 feet. 
Helmsley. — In a valley running north from this romantically situ- 
ated town, grow the Cypripedium, Epipactis nidus avis, &c. 
THE WOLDS. 
External Configuration. — The features which are common to 
all the chalk ranges of England, shew themselves boldly in Yorkshire. 
Rising, in the Wilton Beacon, to the height of 805 feet, the Wolds 
overlook the wide vale of York on the west and the small vale of 
