PREFACE. 



THE Authors of Original Papers and Communications in the 

 present Volume are Dr. John Bostock ; James BoVnev, Esq.; 

 J. B. ; E. F.'G. H. ; J. B. van Mons; Mrs. Agnes. Ibbetson ; 

 W. Saint, Esq, ; Mr. B. Cook ; Mr. J. Acton; Mr. H. B. Bate* 

 James Staveley, Esq.; Sir George Cayley, Bart.; Mr. G. J. 

 Singer; R. Z. A. ; W. N. ; M. le Comte de Bournon, F. R. and 

 L. S. ; Mr. Robert Lyall; Mr. P. Barlow ; J. F. ; Mr. Robert 

 Bancks. 



Of Foreign Works, Prof. F. R. Curaudau ; M. Gay-I.ussae ; 

 M. Thenard ; M. Alex. Brongniart ; Prof Lenormand ; M. Hassen- 

 fratz; M. Hatty ; M. Rampasse ; Prof. Picot; M. L. Cordier ; M. 

 Descotils; P. A. Steinacher; M. Bouillon- Lagrange; M. Vogel ; 

 M. Fourcroy ; M. Vauquelin ; M. Cuvier; M. Chaptal ; M. Ber- 

 thollet, Jun. ; M. Klaproth ; M. Bucholz ; M. Berthier. 



And of British Memoirs abridged or extracted, Humphry Daw, 

 Esq. Sec. R. S. F. R. S. Ed. and M. R. I. A. ; Capt. W. Boiton; 

 Capt. H. L. Ball ; Mr. John Tad ; Mr. W. Barlow ; J. G. Children, 

 Esq. F. R. S. ; Wm. Henry, M. D. F. R. S. V. P. of the tit. and 

 Phil. Soc. and Physician to the Infirmary at Manchester ; Jariiee 

 Rennel, Esq. F. R. S. 



The Engravings consist of 1. Captain Bolton's improved 

 Jury Mast ; 2. Captain H. L. Ball's Method of Fishing an Anchor; 

 3. Captain Ball's improved Anchor; 4. Mr. J. Tad's Method 

 of causing a Door to open over ^a Carpet ; 5. Mr. W. Barlow's 

 Wrench for Screw Nuts of any Size? 7. The Sting of the Nettle, 

 highly magnified, in its natural State, emitting its Poison, and 

 when broken; 8. The Awn of the Indian Grass, used in Captain 

 Kater's Hygrometer ; 9. The Leaf and Stem of the Sensitive Plant, 

 showing their Structure; 10. The Spiral Wire and its Case greatly 

 magnified; 1 1. Luminous Meteors, seen during a Thunderstorm, 

 by James Staveley, Esq. ; 12. Diagrams to illustrate the Theory of 

 Aerial Navigation, by Sir George Cay ley, Bart.; 13. A Machine 

 that will ascend into the Air of itself by mechanical Means; 14. 

 A Machine with which a Man may raise himself into the Air; 15. 

 Figures illustrating the Crystallization of Endellion, by the Count 

 de Bournon; 16. Diagrams for a Demonstration of the Cotesian 

 Theorem, by Mr. P.- Barlow; 17. Various Delineations and Sections 

 of Grafts and Buds, from original Drawings after Nature, by 

 Mrs. Agnes Ibbetson ; 18. Branch of a Portugal Laurel, from which 

 the Bark had been accidentally separated; 19. Different Structures 

 of several Kinds of Wood. 



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