destructive Malady; being the Subject of three Lectures delivered in the Theatre of the Dublin Royal Society. By Thomas Peall, Esq. Veterinary Professor to that Society. A Practical Treatise on Diseases of the Heart. By Henry Reader, MD. Physician to the South London Dispensary, &c. M. C. Pfeiffer, of Cassel, has lately produced a beautiful Work on the Land and Fresh-water Mollusca of Germany. 4to. With Eight Plates. The work is in German, but the specific characters are given in Latin. A Treatise on the Utility of Sangui-suction, or Leech-bleeding. By Rees Price, MD. 12mo. 3s. 6d. Researches respecting the Medical Powers of Chlorine, particularly in Diseases of the Liver; with an Account of a new Method of applying this Agent, by which its Influence on the System can be secured. By William Wallace, MD. MRIA. MRCS. Ireland, &c. 8vo. 6s. ARTICLE XVI. NEW PATENTS. Sir A. Perrier, City of Cork, Knt.; for improvements in the apparatus for distilling, boiling, and concentrating, by evaporation, various sorts of liquids.-July 27. R. B. Roxby, Arbour-street, Stepney, Gent. for certain improvements on the quadrant.-July 31. W. Cleland, Glasgow, Gent. for an improved apparatus for evaporating liquids.-Aug. 17. D. Mushet, Coleford, Gloucestershire, iron-maker, for an improvement or improvements in the making or manufacturing of iron from certain slags or cinders produced in the working or making of that metal. Aug. 20. W. Mitchell, Glasgow, silversmith, for a process, whereby gold and silver plate, and other plate formed of ductile metals, may be manufactured in a more perfect and expeditious manner, than by any process which has hitherto been employed.-Aug. 24. T. Sowerby, Bishopwearmouth, Durham, merchant, for a chain upon a new and improved principle, suitable for ships' cables, and other purposes. Aug. 29. R. Vazie, Chasewater, Mine Kenwyn, Cornwall, civil engineer, for an improvement in the compounding of different species of metals.Sept. 3. H. Burgess, Miles's-lane, Cannon-street, London, merchant, for improvements on wheel-carriages.-Sept. 3. J The observations in each line of the table apply to a period of twenty-four hours, beginning at 9 A. M. on the day indicated in the first column. A dash denotes that the result is included in the next following observation. REMARKS. 8. Cloudy: windy. 9, 10. Fine. 11. Cloudy: Ninth Month.-1-7. Fine. a little rain in the evening. 14. Cloudy. 15. Cloudy: windy. 16. Overcast. 17-21. Fine. 22. Cloudy: windy: swallows begin to congregate. 23. Cloudy: rainy. 24. Rainy. 25. Fine. 26. Cloudy: fine. 27. Bleak, 28-30, Fine. RESULTS. Winds: N, 3; NE, 9; E, 4; SE, 1; SW, 5; W, 1; NW, 7. ANNALS OF PHILOSOPHY. DECEMBER, 1822. ARTICLE I. Sketch of the Geology of Snowdon, and the surrounding Country. By W. Phillips, FLS. MGS.; and S. Woods, MGS. (Concluded from p. 335.) FROM the elevated ground near Capel Curig, we could perceive in the distance a more favourable atmosphere, at the time when rain and mist prevailed on Snowdon, and the neighbouring mountains. We determined, therefore, to proceed by Llanwrst to Conway, Bangor, and Carnarvon, and to return, if possible, over Snowdon. Between Capel Curig and Conway, we did not perceive any rock with which we were not already acquainted, the slates and lower rock of Moel Shabod prevailing every where, with the same direction of the slaty cleavage. We were particularly anxious to ascend a hill marked j in Mr. Greenough's map, and which, as well as the whole range of which it forms a part, is there represented as being crowned by transition limestone. Our anxiety was increased by having been informed by Mr. Dawson that limestone certainly is not to be found on any part of that range. We ascended the hill on the eastern side of the valley beyond Bettws, and on traversing the whole of it, we could perceive no other rock, nor even any other variety, than such as we have already noticed. As this mountain may be said to be insulated, and, therefore, not forming a part of a range (for it does not exceed about a mile and a half in length), we suspected the hill marked j in Mr. Greenough's map is part of a range still further east, apparently of a different character, New Series, VOL. IV. 2 D being covered the whole of its considerable extent, as far as we could perceive it beyond Llanwrst, with herbage to the very summit; and as we could not detect either from the top of the hill we had ascended, or during our walk of three or four miles to Llanwrst, any lime kiln, or even any rock or important opening, on the sides of the range, we were still doubtful whether limestone formed any part of it. In answer to our inquiries, the landlord of the inn at Llanwrst, an intelligent man, who had kept it during 13 years, assured us that no limestone is found nearer to that town than 16 miles; namely, near Abergelau on the coast; thus confirming the report of Mr. Dawson, that no lime stone is found on the range in question. We have stated that on the hill we ascended, we found no variety of rock, or slate, which has not been previously described, and that the run of the cleavage is NE and SW: the dip is about 54° to the NW; and we had, as we conceived, sufficient evidence to prove that here the slates were interstratified in masses of considerable thickness, with rocks perfectly resembling those of the base of Moel Shabod; the latter forming ridges on the sides of the mountain, with alternate depressions in the spaces occupied by the slates, which, generally speaking, appear to be the most liable to decomposition; and from having a better opportunity of observing on the side of this mountain the nature of the alluvium so prevalent in many places we had visited, and which has been turned over in many instances on the side of the high road to the depth of at least 20 feet, and is of a red colour, we were persuaded that this alluvium is derived from the decomposition of the slates and other rocks every where prevalent. While on this mountain, we were particularly struck by an appearance of stratification on the sides of another above Bettws, composed of the same rocks. This resemblance to stratification, for it is only resemblance, is in a direction not quite at right angles to the plane of the cleavage, in which there are natural fissures that in the distance seem to be perfectly parallel to each other, giving to the whole mass the aspect of regular layers or beds of the same rock. We did not view this mountain sufficiently near to discern the irregularity which we cannot doubt would be visible on the spot, because it has precisely in the distance the same character as is apparent on the northern side of Moel Shabod above the lakes of Capel Curig, and on the side above Pont y Cyffin; the latter we examined closely, and were satisfied that this resemblance to stratification is in fact only a tendency to cleavage, greatly resembling that which in the slates with which they are interstratified, often divides them into the rhombic form, but the lines of separation are not either even, or parallel with each, nor are they always continuous, but often stopped, and are again renewed above or below. In our way from Llanwrst to Conway, we ascended about 600 |