PREFACE 



T 



HE Authors of Original Papers and Communications 

 in the present Volume are, W. H. Wollaston, Sec. R.S.; 

 Mr. W. Skrimshire, Jun. ; WW.; Mr. John Tatum> 

 Jun.; Emeritus; R. T.; W. X. 



Of Foreign Works, C. A. Prieur; C. L. Cadet; 

 M. Desormes; M. Clement; M. Proust; M. Bouillon La- 

 grange ; Dr. Samuel L. Mitchell ; M. Antony Alexis Cadet 

 de Vaux; M. Vauquelin ; M. Antony Thillaye- Plat ; 

 F. F. Delaroche; M. Lamarck ; M. DeLalande; M, La- 

 place; John Michael Haussman; M. Guyton; Dr. Hal- 

 dat; M. Henry; M. Darso; M. Gehlen; M. Erman; 

 M. Delaville; M. Dupont de Nemours; M. Planche; 

 M^And. deGy; M. Chaptal; M. Germon; C. H. Pfaff; 

 M. J. J. Champollion Figeac ; M. Roswag; M. Belle- 

 mere ; Messrs. Von Humboldt and Gay-Lussac; M. Cotte; 

 M.Carnot. 



And of British Memoirs abridged or extracted, Benjamin 

 Count of Rumford; Richard Phillips, Esq.; Dr.W. Rox- 

 burg; Mr. Charles Wilson; Mr. Robert Salmon; Mr. John 

 Austin; Mr. Jessop; M. G. Field; J. Curwen, Esq. MP.; 

 Mr. Charles Waistell; Mr. John Trotter; Mr. James 

 Hardie; Rev. James Headrick. 



The Engravings consist of 1. Camera Lucida, by W. 

 Hyde Wollaston, M D. Sec. R. S.; 2. Decomposition of 

 Light, by C. A. Prieur ; 3, 4. Apparatus of Mr. Thillaye 

 Platel for the Carbonization of Turf; 5. Mr. Tatum's 

 Apparatus for ascertaining the Increase of Temperature 

 by the Galvanic Action; 6. Theory of Looming, or Hori- 

 zontal Refraction; 7. Mr. Salmon's Specimens of good 

 and bad Pruning of Fir Trees ; 8. Mr. Field's Stove for 

 heating or drying; 9. Mr. WaistelPs Horse Hoe; 10. Mr. 

 Curwen's Weed Harrow; 11. Apparatus for triturating 

 Quicksilver; 12. Erman's new Classes of Galvanic Con- 

 ductors; 13. Mr. J. Trotter's Curvilinear Saw; 14. Mr. 

 J. Hardie 's Bookbinder's Cutting Press. 



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