A Critique on the Aplanatic Object-glasses, for diverging Rays, of Vincent Chevalier, ainé et fils. By C. R. GORING, M.D. 248 On the Existence of Chlorine in the Native Black Oxide of Manganese. By JOHN M’MULLEN, Esq. 258 Modern Improvements of Horticulture 261 FARADAY’s _Chemical Manipulation_, reviewed 275 Statistical Notices suggested by the actual State of the British Empire, as exhibited in the last Population Census. Communicated by Mr. MERRITT 283 On the Modern Ornaments of Architecture, &c. 292 _De l’Influence des Agens Physiques sur la Vie_. Par W. F. EDWARDS, D.M. &c., reviewed 296 Experiments on Thought 308 Hieroglyphical Fragments, illustrative of Inscriptions preserved in the British Museum, with some remarks on Mr. Champollion’s opinions. In a letter to the Cav. San Quintino 310 On the Naturalization of Fish. By J. MAC CULLOCH, M.D., F.R.S., &c. 320 WADD’s _Nugæ Chirurgicæ or, a Biographical Miscellany_, reviewed 329 _Nugæ Canore, by_ UNUS QUORUM, reviewed _ib._ WADD’s _Mems., Maxims, and Memoirs_, reviewed _ib._ On Tic Douloureux 346 Remarks on some Quadrupeds supposed by Naturalists to be extinct. By JOHN RANKING, Esq. 350 Description of a cheap and portable Instrument for enabling Young People to acquire a knowledge of the Stars, or determine their situation in the Heavens. By S. LEE, Esq. 371 CARUS’s _Introduction to the Comparative Anatomy of Animals_, reviewed 377 _Comparative Value of the principal Varieties of Fuel, &c., by_ MARCUS BULL, reviewed _ib._ DANIELL’s _Meteorological Essays and Observations_, reviewed _ib._ _Philosophical Transactions of the Royal Society for 1827_, reviewed _ib._ _Practical Treatise on the use of the Blowpipe, by_ J. GRIFFIN, reviewed _ib._ _Circle of the Seasons, and Practical Key to the Calendar and Almanack_, reviewed _ib._ _Conversations on the Animal Economy_—reviewed _ib._ Notice of a New Genus of Plants discovered in the Rocky Mountains of North America by Mr. DAVID DOUGLAS. By JOHN LINDLEY, Esq. 383 A Description of the Aurora Borealis seen in London on the Evening and Night of the 25th of September, 1827, with Critical Remarks, &c. By E. A. KENDALL, Esq., F.S.A. 385 Proceedings of the Royal Society 424 Proceedings of the Horticultural Society 425 ASTRONOMICAL AND NAUTICAL COLLECTIONS i. Ephemeris of the periodical Comet for its Return in 1828, computed with the consideration of a resisting Medium. By Professor ENCKE 428 ii. Elementary View of the undulatory Theory of Light. By Mr. FRESNELL 431 iii. Remarks on the action of Corpuscular Forces. In a letter to Mr. POISSON 448 iv. Calculations of Lunar Phenomena. By THOMAS HENDERSON, Esq. 450 MISCELLANEOUS INTELLIGENCE. I. MECHANICAL SCIENCE. 1 On the Adhesion of Screws 453 2 Improvement in Steam-engines _ib._ 3 Improved Clock 454 4 Method of dividing Glass by Friction _ib._