PREFACE. 



HE third Volume of this Miscellany being now com- 

 pleted, I have again the opportunity of making my acknow- 

 ledgements to its friends and supporters, and presenting the 

 respectable list of its Authors. 



The authors of original Papers are John Bostock, M. D. 

 Mr. Rob. Jameson ; the Rev. James Wilson, A. M. ; John 

 Gough, Esq. ; Mr. Ez. Walker ; Rev. Joseph Priestley, 

 L.L.D. F.R.S.; Rev. W. Pearson, P.R.I.; Dr. Thomas 

 Young, F. R. S. and Professor at the Royal Institution; 

 Mr. Peter Keir; Mr, John Dalton ; Mr. Wm. Wilson; R. 

 Chenevix, Esq. F. R. S. ; Mr. John Cuthbertfon ; Mr. John 

 Murray ; J. B. ; W. N. ; and ProfeiTor Aldini. — Of foreign 

 works; Hapel Lachenaie ; Brongniart; J. B. Berard ; 

 Guyton ; Gay Lussac ; Ekeberg ; B. Prevost. — And of Eng- 

 lish Memoirs abridged or extracted, Dr. Young ; Mr. R. 

 Phillips; Mr. J. Besant; Edw. Howard, Esq.; F. R.S.* 

 Sir H. C. Englefield, Bart. F. R. S.j Mr. J. Dalton; Mr. 

 H. Davy, ProfeiTor at the Royal Institution ; T. Wedgwood, 

 Esq.; R. Chenevix, Esq. F. R.S. Mr. Wm. Henry. 



Of the Engravings the Subjects are, 1. A powerful Blow- 

 pipe by Alcohol. 2. Mr. Wilson's two new Barometers. 

 3. An improved Water Wheel, by Mr. Besant. 4. Mr. R. 

 Phillips's Tubes for driving Copper Bolts into Ships. 5. The 

 Hydrometer of Atkins, for exhibiting Specific Gravities and 



Strengths 



