Nº. 2. seems of the reed tribe: the knobs placed in rows, which are like the vesicles on the _quercus marina_, and some other _algæ_, are very remarkable. Woodward, Catalogue B. page 9. specimen _a._ 1. exhibits an impression akin to this, which he imagines to be of the fern kind. Nº. 3. from a coal-pit in Yorkshire. I cannot but think this impression is owing to somewhat of the fir kind. Dr. Woodward, who exhibits such a like impression, Catalogue B. p. 16. specimen _a._ 108. imagines the same: his words are, “The impression is much like what might be made by the branches of the common fir, after the leaves are fallen or stript off.” Nº. 4. seems to be of the same kind as Nº. 2. Nº. 5. This extraordinary impression is from Mostyn-colliery in Flintshire. It is a little obscured; but, when attentively viewed, exhibits a reticular impression, the meshes whereof are rhomboidal hollows, and the sides of the rhombs, or the net-work, are raised, or in relief. Nº. 6. is from Newcastle. Volckman, ibid, part 3. tab. 4. fig. 9. seems to be of this kind. Nº. 7. The same author, Volckman, figures a somewhat-like impression, ibid. fig. 5. Only these seven extraordinary impressions I have presumed, my Lord, to treat of at this present time; but I have many more in my cabinet equally curious, some few of which I here exhibit to the Society, without taking any further notice of them: only I shall add, that many extraordinary impressions occur in Woodward’s and other collections, and many are iconed in authors, worthy the attention of the curious. These impressions, my Lord, are not only met with in small pieces; but large evident branches, some feet in length, have been found. I have, in the collieries of Derbyshire, frequently traced branches with (what seemed to me) long narrow leaves proceeding from them, and parts of other vegetables, above a foot’s length: but the hardness of the substance they are immersed in renders it impossible to get them out without breaking them to pieces[140]. As these remains of vegetables are very extraordinary, I would recommend to the curious in botany to take notice of them, as an _Appendix Plantarum adhuc incognitarum_. For my part, I am so very little skilled in botany, that I hardly presume to offer my opinion; which is, that they are impressions and parts of species of the firs and pines, of the tithymals, the cereus’s, and other arborescent plants, and of large reeds; for some of the said kind are embellished with ribbed, studded, and reticulated works; _e.g._ the Hercules’ club, or _rubi facie senticosa planta Lobelii_, described by Dr. Grew, _Museum Reg. Soc._ p. 221. the _cerei, &c._