PREFACE. 



THE Authors of Original Papers and Communications in the 

 present Volume are J. Bostock, M. D. ; Mr. J. Cuthbertson ; 

 A. M.; J. A. De Luc, Esq., F. R. S., &c; Mr. Charles Sylvester ; 

 J. D. Maycock, Esq.; P.; Richard Lovell Edgeworth, Esq. 

 M. R. I. A. ; Prof. Wood ; Luke Howard, Esq. ; Mr. G. J. Singer ; 

 T. Le Gay Brevverton, Esq. ; G. O. P. 



Of Foreign Works, Dr. Haldat; Mr. Fourcroy; Mr, Vauque- 

 lin; Alexander von Humboldt; Prof. Klaproth ; Prof. Viviani; 

 Prof. Tourte; Mr. Guyton-Morveau ; Mr. Finhof; Mr. Tromms- 

 dorff; Mr. Hassenfratz"; Mr. E. Berard ; Mr. Derosne; Mr. Thaerj; 

 Mr. Theodore de Saussure; Mr. Marcel de Serres ; Hichard Che- 

 nevix, Esq. F. R. S. M. R. f. A. &c. ; Count Dunin Borfcowski; 

 Mr. ***; Mr. J. C. Delametherie; Mr. J. J. Omalius de Halloy ; 

 Count von Mellin ; Prof. Kries; Mr. Sonnini; Mr. Nose. 



And of British Memoirs abridged or extracted, William 

 Brande, Esq. F. R. S. ; Mr. John Saddington; Major Spencer 

 Cochrane ; Mr. J. P. Hubbard; Henry Cavendish, Esq. F. R. S. ; 

 Mr. Robert Salmon; Everard Home, Esq. F. R S. ; Mr. George 

 Prior; Mr. John Ducket Ross; Mr. George Williams; Mr. J. 

 Varty; William Henry, M. D. F. R. S. V. P^ of the Lt. and Phi). 

 Soc. of Manchester; Mr. W. Wallis Mason; Mr. Timothy Fisher; 

 Mr. Peter Tansley; Humphry Davy, Esq. Sec. R. S. F. R. S. E. 

 M. R. I. A. ; Mr. William Salisbury j Rev. Wm. Lax, A. M. F. R.S. 

 and Lowndes's Professor of Astronomy. 



The Engravings consist of 1. Mr. Cavendish's Method of 

 Dividing Astronomical Instruments; 2. Professor Copland's insu- 

 lating Handle for an Electrical Machine; 3. Mr. Robert Salmon's 

 Man-trap for securing Depredators without injuring them; 4. his 

 Screw for fixing any Thing securely in the Ground ; 5. his Method 

 of building Pise, or Earthen Walls; 6. Mr. De Luc's Appa- 

 ratus for Analysing the Galvanic Pile; 7. his Dissection of the 

 Galvanic Pile; S. Mr. George Prior's Clock Escapement; 9. Mr. 

 G. D. Ross's Eye Bath ; 10. Diagram to illustrate Prof. Wood's 

 new Theory of the Rotary Motion of the Earth ; 1 1. Mr. G. Wil- 

 liams's Method of Securing the Beams of Ships, without wooden 

 Knees; 12. Mr. J. Varty's improved Linchpins; 13. An Iron Cy- 

 linder burst by Electricity ; 14. Arrangement of the Strata of the 

 Hill of Durbuy ; 15. Mr. Mason's Trochar for the Relief of Hoven 

 Cattle; 16. Mr. Fisher's Swivel-headed Churnstaff; 17. Mr. Tan- 

 sley's Shag Cutter; 18. Mr. .Davy's new Electrochemical Appa- 

 ratus. 



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