m. 
Thirty- seven attain in Yorkshire their northern limit, viz. 
Anemone Pulsatilla 
Hntcliinsia petraea 
Diantlins Caryophyllus 
Silene Otites 
nutans 
Arenaria tenuifolia 
Radiola Millegrana 
Hypericum Androssemum 
Trifolium ornithopodioides 
Lathyrus latifolius 
Rnbus rhamnifolius 
leucostacbys 
macrophyllus 
Rosa micrantha 
Sedum dasypbyllum 
sexangulare 
Cotyledon umbilicus 
Campanula patula 
liederacea 
Campanula rapunculoides 
Scrophularia vemalis 
Galeobdolon luteum 
Stachys germanica 
Mentha acutifolia 
Nepeta cataria 
Teucrium Scordium 
Orobanche minor 
Flippophae rhamnoides 
Scheuchzeria palustris 
Epipactis palustris 
Crocus nudiflorus 
Ornithogalum umbellatum 
Typha angustifolia 
Acorus calamus 
Lemna gibba 
polyrhiza 
Cuscuta Epithymum 
Such are the results of a comparison between Yorkshire and other 
large districts lying to the north and the south : let us now turn to 
consider the characters of the several natural divisions of this great 
County, and the Botanical peculiarities which accompany them. 
Yorkshire, it has been observed,* is one of the few Counties of 
England which are defined by natural boundaries. On the west it 
reaches, and in some places extends beyond, the great summit ridge of 
the island ; the Tees is its natural limit on the north, the Dun for a 
great length on the south, and on the east it is washed by the German 
Ocean. Within the large area thus defined, are several great natural 
districts, possessing strong marks of distinction. These attracted the 
attention of the celebrated naturalist. Dr. Lister, who resided at York, 
and who in his propose,! for a new set of maps, communicated to the 
Royal Society in 1683, presents a sketch of the geological constitution 
of four great districts in Yorkshire. 
“ 1. The Wolds : — chalk, flint, and pyrites, &c. 
2. Blackmoor : — moors, sandstone, &c. 
3. Holderness : — boggy, turf, clay, sand, &c. 
4. Western Mountains : — moors, sandstone, coal, ironstone, lead- 
ore, sand, clay, &c.” 
In this enumeration. Lister has omitted one of the most remarkable 
features of the County, the continuous vale which from the Tees to the 
Trent separates into two tracts the hilly districts of Yorkshire, and gives 
See Professor Phillips’s Illustrations of the Geology of Yorkshire, vol. 1. 
