15 



are now necessary. This construction will also be attended with 

 the advantage of requiring a much smaller thickness in the plate- 

 glass, and will thus facilitate the selection of proper pieces of glass 

 for being worked into an object lens. 



From all these considerations, the author entertains the confi- 

 dent expectation of being able, with proper assistance, to construct 

 a telescope of two feet aperture and 24 feet in length, which 

 would as much exceed the most powerful telescopes of the present 

 day, as these exceed the refractors which existed at the close of the 

 last century. 



December 16. 



His Royal Highness the Duke of SUSSEX, President, in the Chair, 

 The following Presents were received,and thanks ordered for them: — 



Illustrations of Mr. S. Cooper's Surgical Dictionary. Published 

 Monthly. Each Part containing four Lithographic Plates, with 

 Letter- press descriptions, and references to the Text. Parts 1-3, 

 8vo. — Presented by the Author. 



Occultations of Fixed Stars by the Moon in November and Decem- 

 ber. 1830. Computed for Greenwich, by Thomas Henderson, 

 Esq.-— The Astronomical Society. 



The Geographical System of Herodotus examined and explained, 

 by a comparison with those of other ancient Authors, and with 

 modern Geography. With Dissertations on the Itinerary Stade 

 of the Greeks, the Expedition of Darius Hystaspes, the position 

 and remains of ancient Babylon, the alluvions of the Nile, and 

 Canals of Suez ; the Oasis and Temple of Jupiter Amraon, the 

 ancient circumnavigation of Africa, and other subjects of History 

 and Geography. 2nd Edition, revised. By James Rennell, Esq, 



■ F.R.S. 8vo.— Mrs. Rodd. 



Elements of the Economy of Nature, or the Principles of Physics, 

 Chemistry, and Physiology; founded on the recently discovered 

 Phenomena of Light, Electro-Magnetism, and Atomic Chemistry. 

 By J. G. Macvicar, M.A. 8vo. — The Author. 



Illustrations of the atmospherical Origin of Epidemic Diseases. 2nd 

 Edition. By T. Forster, M B. 8vo. — The Author. 



Observations on the Union which has become necessary between the 

 hitherto separated branches of the Medical Profession, and on 

 the Foundation of a Faculty of Medicine. By T. Forster, M.B. 

 8vo. — The Author. 



On the Glanders in the Human Subject. By John Elliotson, M.D. 

 F.R.S. 8vo.— The Author. 



Science without a Head or the Royal Society dissected. By one 

 of the 687 F.R.S. sss. 8vo.— The Author. 



Berliner Astronomisches Jahrbuch fur 1832. Mit Genehmaltung 

 der Kbniglichen Academie der Wissenschaften, herausgegeben 

 von J. F. Encke, Konigl. Astronom. 8vo. — Professor Encke, For. 

 Mem. R..S. 



