«1 PREFACE. 



HE Authors of Original Papers and Communications 

 in the present Volume are, Mr. Charles Sylvester ; J. S. 

 Traill, M. D. ; Mr. Richard Winter ; Philommatos ; A 

 Chemist; J. G. C; William Henry, M. D.; Thomas 

 Thomson, M. D. F. R. S. E.; Mr. William Skrimshire, 

 Jun.; John Gough Esq.; G. S. Gibbes, M. D.; 

 N. R. D.; Joseph Reade, M. D ; Mr. Donovan; Mr. 

 Barraud; Dytiscus; J. Garnett, Esq.; The Rev, T. 

 Vince, Professor of Astronomy at Cambridge ; and Fre- 

 derick Stromeyer, M. D. Professor at Gottingen. 



Of Foreign Works, M. La Lande ; J. Carradori de 

 Prato, M. D.; M. Decandolle; M. Trommsdorff ; M. 

 Bernhardi; M. Robiquet; M. Chevreul; M. C. A. Cadet; 

 M. Vauquelin; M. Boullay; M. Hisinger; M. Berzelius; 

 M. Thenard; Dr. Berger; Mr. Adolphus Ledhuy. 



And of British Memoirs abridged or extracted, Mr. 

 Davis; Humphry Davy, Esq. F. R. S. M. R. I. A.; Wil- 

 liam Hasledine Pepys, Esq.; Right Hon. Sir Joseph 

 Banks, Bart, Tv. B. P. R. S. &c; Thomas Andrew Knight, 

 Esq. F. R, S. ; Everard Home, Esq. F. R. S; William 

 Herschell, L. L. D. F. R. S. ; William Allen, Esq. F. L. S. ; 

 John Jerome Schroeter, F. R. S.; Mr. Lewi n Tug well; 

 Dr. Cogan; Mr. Robert Hallett; Brigade Major William 

 Lambton; C. H. Parry, M. D.; T. Davis, Esq.; W. 

 Matthews, Esq.; Dr. Anderson; Mr. Edward Martin; 

 W, H. Wollaston, M. D.; and W. Roxburge, M. D. 



The Engravings consist of 1. Guide to the Constella- 

 tions; 2. Mr. Davis's Machine for Glaziers; 3. Mr. Davy's 

 Experiments oq Galvanism; 4. New Eudiometer by W. 

 H. Pepys, Esq.; 5. Experiments on inflected Light, by 

 Mr. R. Winter; 6 and 7. Dr. Hershell on coloured con- 

 centric Rings; 8. Dr. Joseph Reade's Calorimeter; 9. 

 Messrs. Allen and Pepys on Carbonic Acid, and the 

 Diamond; 10. Mr. Barraud's Mercurial Pendulum; 11. 

 Dr. Hershell on the Planet Vesta; 12. Mr. Tugwell's 

 new Method of Roofing Houses; 13. Representation of a 

 Mineral Bason in South Wales. 



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