Proceedings of the Royal Society of Edinburgh.

Date:
1844
Catalogue details

Licence: Public Domain Mark

Credit: Proceedings of the Royal Society of Edinburgh. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

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    desideratum in nomenclature, and as no such fossil appears to have been described or figured, we have named it ‘ Lyginodendron Lands- burgiiforming the generic namo from Xoyivos, wicker-work, and divdgov, a tree ; and dedicating it by, its specific name, to its discoverer, Mr Landsborough.” The fragments of the fossil were spread over a space of about two yards, and have not been observed, except in that place. The finest specimen obtained was about 18 inches in length, by 3 in breadth. It was discovered in the middle stratum. Of the genus Sigillaria there arc two or three varieties, as Sigil- laria oculata, Sigillaria reniformis, &c. &c. The most magnificent fossil found in the quarry is the Bothroden- dron punctatum. A splendid specimen of this fossil is in the pos- session of Mr Landsborough, which he describes to be of a size and weight which he can scarcely lift from the ground. It is extremely rare, however; only two, or at most three, examples of it have been procured. Another very curious and remarkable fossil also, is the Stylolithen, of which there appears to be two distinct varieties—one with very broad stripes, the other with the lines more closely approximating, and, likewise, more deeply indented. Specimens of all the before-mentioned fossils were contained in tho collection presented to the Society. The author presented at the same time some masses of impure ironstone, from a coal-pit on the same estate, containing very beautiful specimens of the Unio Uni. 2. On a new Self-Registering Barometer. By Robert Bryson, F.R.S. From tho nature of the instrument, it is impossible to give an in- telligible abstract of the paper. The paper, with a description of the instrument, and a statement of its indications for some months, is published in the Society’s Transactions. Monday, 15th January 1844. Dr ABERCROMBIE, V. P., in the Chair. The following Communications were read — 1. On the Vibrations of an Interrupted Medium. By Pro- fessor Kelland. The object of this paper was the approximate determination of the chango of phase, and intensity of a ray reflected at tho surface of a medium, which admits of no refraction.