T 



PREFACE. 



HE Authors of Original Papers and Communications In the 

 present Volunne are Sir George Cayley, Bart. ; Mr, Acton; 

 Mr. Kohert Lyall; T. L. N. ; W. Henry, M. D. ; A. M. ; N. ; 

 ?^r. T. Sheldrake; T.LeGay Brewcrton, Esq. F R.Phys S. Edin.; 

 Mr. P. Barlow ; Francis Ellis, Esq. ; W. N. ; G. O. ; A. B ; J. Bos- 

 tock, M. D.; J. F. ; C. ; Mr. 11 Winter; G.Cumberland, Esq.; 

 T. Forster, Esq.; L. O. C ; Mr. B. Cook; Rev. J. Bianchardj 

 Dr. Clarke; J. Gough, Esq. 



Of Foreign Works, M. Modeste Pareletti ; M. Bucholz ; M. 

 Hassenfratz; M. Vauquelin; M. Kiaproth; M. Rolnquet; M. 

 C. L. Berthollet; M. Guvton-Morveau ; Prof. Proust; M.Coutelle; 

 Dr. Haldat; J. B. Mollerat ; Mr. W. P»^aclnre, F. Pi)il. Soc. of 

 Philadelphia; M. Descroizilles, S-nr. ; B. L ; M. Lanoicr; M. 

 Fourcroy ; M. Theodore de Sanssure; M. Prieur; M. J. C. Dela- 

 metherie; M. Parmentier; M.Theodore de Grotthuss; M. Pey- 

 rard; M. Gehlen. 



And of British Memoirs abridged or extracted, Mr. Edward 

 Trou^-hton ; W. Hyde Wollaston, M. D. Sec. R. S. ; T. A. Knight, 

 Esq. F. R. S. ; H. Davy, p:sq. Sec. K. S. Prof. Chera. R.' 1. ; 

 Everard Home, Esq. F. R. S; Mr. W. Brande; G. PcarsoiT, M. D. 

 F. R S. ; J. Miller, Esq. ; W. Alien, Esq. F. R. S. ; W. Hasledine 

 Pepys, Esq. F. R. S. ; Lieut. James Spratt, R. N. ; Richard 

 White Esq. ; Mr. R. Porrett, jun. ; Capt. W. Bolton, R. N. ; Rev. 

 W. Gregor. 



The Engravings consist of 1. Figures 1,4,5,6, and 7, (in 

 one Quarto Plate) of Mr. Troughton's Apparatus for dividint^ 

 Astronomical Instruments; 2. Figs. 2 and 3, of Mr. Troughton's 

 Apparatus for dividing Astronomical Instruments ; 3. Diagrams 

 illustrating the Art of Aerial Navigation, by Sir George. Cayley, 

 Bart; 4. Leaf of the Mimosa Pudica, by Mr. Robert Lyail ; 5. S^ir 

 George Cayley on Aerial Navigation ; 6. Apparatus for procuring 

 Potassium ; 7. Dr. Wollaston's retiecting Goniometer; 8. The In- 

 tervertebral Joint of the Shark; 9. Mr. Miller's Drag for finding 

 and raising the Body of a Person drowned; 10. FPis Reel Safe- 

 guard, for the Security of a Person going to the Assistance of on&, 

 Drowning ; 11. His Missile Rope to be Hung to a Person in Danger 

 ©f being drowned ; 12. Apparatus of Messrs. Allen and Pepys, for 

 the Respiration of Gasscs by Animals ; 13. Lieutenant Spratt's 

 Homograph; 14. Mr. White's improved File for Letters, Receipts, 

 &c. ; 15. Diagrams illustrative ot certain Properties of Solids, by 

 John Gough, Esq.; 16. Capt. W. Bolton's Method of rigging his 

 Jury Mast, and setting una Ship's lower Rigging. 



TABLE 



