326 Geological Society. presso-conicis, basi rhomboideis ; areolis junioribus tomentosis, reliquis nudis ; aculeis radiantibus 22 brevissimis, setiformibus, interioribus 5-6-8 elongatis et horum uno quandoque central! ; omnibus levi tactu deciduis, niveis, centralibus apice rufis, Mammillaria recurvispina, M. simplex, glaucescens, subgloboso-depressa, mammillis conico-obtusis, crassis ; areolis et axillis nudis. Aculei 8. Unus su-premus tenuissimus, infimus longissimus crassior, reliqui tria paria efformant opposita. Omnes sunt reflexi, curvati, radiantes. Notices respecting PcBderia ; by P. W. Korthals. The author re-marks, that as Musca vomitoria is misled by the peculiar smell of the Aroidese, just so is M. sarcophaga misled by plants of this genus. — Description of the Gcettingen Botanic Garden ; by Dr. J. F. Hoff-mann. — Botanical Notices, by Dr. J. F. Hoffmann : On Lemna ar-rhiza ; On the Occurrence of Petiolated Hairs in ViUarsia nymph(B' aides and other Aquatic Plants ; On the Spontaneous Ignition of Dictamnus albus. — F. A. G. Miguel De Encephalarto horrido, Lehm., ejusque formis. — Botanical Notices, by C. Mulder : Vegetable Mon-strosities. — J. Van der Hoeven on the Heart of the Crocodiles, with an account of our knowledge thereof. — Dr. H. Schlegel on the Nos-trils in Sula. — Notices of Works : Huschke De Bursse Fabricii ori-gine ; Gould's Birds of Australia ; ImhofF's Genera Curculionidum. No. m. Anatomy of the Scorpion Fly (Panorpa communis) ; by Dr. A. Brants. — Dr. A. J. D. Steenstra Toussaint De Systemate Uropoetico Squali glauci. — Q. M.*'R. Verhuell on the Differences between Pieris Napi and Pieris Rapce. — H. C. Van Hall on the Increase of Trees in Thickness. — A. C. C. F. Van Winter's Geognostical Notices of the Basalts of the Central Rhine. — Notices of Works : Analysis of the New Transactions of the First Class of the Royal Institute of the Netherlands ; Archives du Museum d'Histoire Naturelle ; Mayer's Comparative Anatomy ; Van Deen's Anatomical Description of a monstrous 6-legged Frog ; H. Schlegel's Drawings of Amphibia, 2nd Decade; J. Muller on the Auditory Organs in the Cyclostomi; Peligotand Decaisne on Sugar Beet-root. PROCEEDINGS OF LEARNED SOCIETIES. GEOLOGICAL SOCIETY. Nov. 18, 1840. — Read the first part of a Memoir on the Evi-dences of Glaciers in Scotland and the Nortli of England, by the Rev. Prof. Buckland, D.D., Pres. G.S. Dr. Buckland's attention was first directed by Prof. Agassiz in October 1838 to the phsenomena of polished, striated, and furrowed surfaces on the south-east slope of the Jura, near Neuchatel, as well as to the transport of the erratic boulders on the Jura, as the effects of ice ; but it was not until he had devoted some days to the exami-
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