Page:Transactions of the Provincial Medical and Surgical Association, volume 2.djvu/226

 of different degrees of thickness, and then a very shallow coal, varying from one to three feet; it is very sulphurous, and, with the exception of what is used in the immediate neighbourhood, is converted into cokes. It seems to be a general opinion among the miners, that there is a deep coal formation, but that the expence of working it would be so great, as not to pay the proprietors.

Some of the springs contain large quantities of carbonate of lime in solution, which is precipitated when the water reaches the surface; occasionally, large masses of tufa are formed.

Vegetation is at least a fortnight later in the clay district than where the sand prevails, but, on the other hand, the autumnal flowers continue several weeks later in the former than they do in the latter.

It is natural to suppose that, in such a varied surface, a variety of botanical specimens would be met with. The following are most of the medicinal, together with some of the scarcer plants:─