Page:Transactions of the Natural History Society of Northumberland, Durham, and Newcastle-upon-Tyne (1867).djvu/326

308 includes Dorset, Wilts, Hants, and Sussex, 5464 square miles, yields one thousand and forty species. Next to these comes the Humber province, which is conterminous with Yorkshire, has an area of 5836 square miles, and yields one thousand and fifteen species. This number is higher than that of the Midland provinces, because, although in the latter the number of southern species is greater than in Yorkshire, the number of northern ones is very much fewer. As compared with Yorkshire, the Tyne province has only about half its area and eighty fewer plants. In northern species they are nearly upon an equality, the difference between the two being almost altogether caused by the absence beyond the Tees of southern plants which run out in Yorkshire. For the northern half of Wales we know nine hundred and thirty-eight species, for the Mersey province, which includes Cheshire and Lancashire, eight hundred and forty-two, for the two Lake counties and Isle of Man eight hundred and sixty, but for none of these three have Floras been written, and we cannot consider their lists complete, whilst for our own province we cannot expect any material increase.

5. — We have seen in Yorkshire how rapidly the southern types thin out. Through our two counties this continues in a marked manner, and the following seventy-seven species which we have admitted fail to reach Scotland.

Twenty-eight reach Cheviot-land, viz :—