^{page 280 note *} In concluding my mineralogical account of this deposit, I would observe, that my intelligent young friend, Dr Simpson of Bathgate, was the first to inform me, after the reading of my paper, that the limestone of Kirkton had been noticed in an article by Dr Fleming, published in the Edinburgh Journal of Science for April 1825, (p. 307.) In this paper, a brief allusion is made to the siliceous laminæ of the limestone, as well as to its botryoidal and mammillary structure. It is also stated, that “several trunks of trees with their branches” had turned up, in which concentric zones and perpendicular fibres were visible. Dr Fleming's remark, that this limestone “encloses the remains of those marine animals which are common in the limestones of the coal formation,” I consider as a mistake. The memoir is entitled, “On the Neptunian formation of Siliceous Stalactites.” It is almost entirely theoretical, being a defence, in reference to siliceous developments, of the doctrine taught by Werner.

I may also add, that since an abstract of this memoir appeared in print, Mr Maclaren of Edinburgh has published (in the Scotsman) some very ingenious observations upon the trap-rocks in the immediate vicinity of this thermal deposit, in which their stratified character is advocated. I am sorry that the extreme length of my memoir prevents me from entering into an explanation of his views, and from expressing my own opinion regarding them.

^{page 281 note *} In concluding this account of the Eurypterus, I beg to express my best thanks to Dr Simpson of Bathgate, for giving me the opportunity of describing the specimens in his possession, as well as to Mr Smith of Jordanhill, for the loan of the specimen in the Andersonian Museum of Glasgow.