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Commentarii de rebus in Scientia Naturali et Medicina gestis, 

 Vol. 1-37. Svo. Lipsise 1752-1803. 



Supplementa et Indices; Vol. 1-6. 8vo. 1763-93. — - 



Sir Thomas Phillipps, Bart. F.R.S. 



Elements of Chemistry, including the recent Discoveries and Doc- 

 trines of the Science. By Edward Turner, M.D. F.R.S. 8vo. 

 183 J.— The Author. 



On the Natural History of the Vicinity of Stockton-on-Tees. By 

 John Hogg, M.A. 8vo. — The Author. 



The Genera and Species of Orchideous Plants. Part I., Malaxidese, 

 By John Lindley, Esq. F.R.S. Svo.— The Author. 



The Genera and Species of Orchideous Plants, by John Lindley, 

 Esq. F.R.S.; illustrated by Drawings on Stone from the Sketches 

 of Francis Bauer, Esq. F.R.S. Parti. Fructification and Genera. 

 Folio. — The Authors. 



Researches about Atmospheric Phenomena. Third Edition, cor- 

 rected and enlarged, with a Series of Engravings illustrative of 

 the Modifications of the Clouds : to which is added the Calendar 

 of Nature. By Thomas Forster, M.B. 8vo. — The Author. 



Sections and Views illustrative of Geological Phenomena. By H. 

 T. de la Beche, Esq. F.R.S. 4 to.— The Author, 



On the recent Improvements in the Art of distinguishing the va- 

 rious Diseases of the Heart, being the Lumleian Lectures deli- 

 vered before the Royal College of Physicians in the year 1829. 

 By John Elliotson, M.D. F.R.S. folio.— The Author. 



A Letter to Sir James M'Grigor, M.D. F.R.S., on the Sanitary Ma- 

 nagement of Gibraltar Fever. By David Barry, M.D. 8vo. — 

 The Author. 



Medicine no Mystery ; being a brief Outline of the Principles of 

 Medical Science : designed as an Introduction to their general 

 Study, as a branch of a liberal Education. Second Edition. By 

 John' Morrison, M.D. 8vo.— The Author. 



A short Treatise on the Principles of the Differential and Integral 

 Calculus. Part II. By the Rev. Baden Powell, M.A. F.R.S. 8vo. 

 — The Author. 



An elementary Treatise on the Geometry of Curves and Curved 

 Surfaces, investigated by the application of the Differential and 

 Integral Calculus. By the Rev. Baden Powell, M.A. F.R.S. 8vo. 

 — The Author. 



The London Literary Gazette. Nos. 723-4. — The Proprietors. 



A Paper was read, entitled, " On the performance of fluid re- 

 fracting telescopes, and on the applicability of this principle of con- 

 struction to very large instruments." By Peter Barlow, Esq. F.R.S. 

 Corresponding Member of the Institute of France, of the Imperial 

 Academy of Petersburg, &c. 



In the first part of this paper the author adduces proofs of the efficacy 

 of telescopes constructed with fluid lenses, on the principles deve- 

 loped in his two former papers, published in the Philosophical Trans- 

 actions, in separating double stars, resolving nebulee, and exhibiting 



