TABLE OF CONTENTS 



TO THIS NINTH VOLUME. 



SEPTEMBER, 1804.. 



Engravings of the following Obie<$ls: 1, 2. Two Plates of Apparatus for Ex- 

 periments on Heat, by Count Rumford ; 3. A new Eleftrical Inftrument, by 

 Mr. Wilfon ; 4. A new Filtering Apparatus, by ProfefTor Parrot} 5. Ori- 

 ginal Blow-Pipe, by the Abbe Melograni. 



I. Letter from Mr. John Gough, containing a Narrative of fome lefs common 

 Effects of Lightning, by the Rev. Jonathan Wilfon, and Remarks by the Com- 

 municator - . - > . - - Page 1 



II. On the Computation of Tables of Squares and Cubes. In a Letter from 

 E. O. - - - - - - 4 



III. Analyfis of a Triple Sulphuret of Lead, Antimony, and Copper, from 

 Cornwall. 3y Charles Hatchet, Efq. F. R. S. From the Philofophical 



Tranfaaions for 3 804 . _ . - J4 



IV. Defcription of a compound Electrical Inftrument for condenfing and dou- 

 bling} with Experiments. By Mr. Wilfon - - 19 



V. Note refpe6ling the Sufpenfion of Zinc in Hidrogen, and the confequent 

 Ignition and Fuficn of Platina Wire. By Amicus - - '24 



VI. Defcription of a Blow-Pipe zSi'mg by the PreiTure of Water, by the Abbe 

 Melograni. In a Letter from Mr. G. B. Greenough - i'5 



VII. Outlines of the Mineralogical Syftems of Rome de Lifle and the Abbe 

 Hauyj with Obfervations. By the Abbe Buee. Communicated by the Hon. 

 Robert Clifford - - - - - 2G 



VIII. Defcription of a Filtering Machine, invented by Profeflbr I'arrot of 

 Paris. In a Letter from a Correfpondent - - - 40 



IX. Medico-Chemical Refearches on the Virtues and Principles of Cantharides. 

 ByH. Beaupoil - - - - - 41 



X. Experimental Determinations of the Latent Heat of Spermaceti, Bees' Wax, 

 Tin, Bifmuth, Lead, Zinc, and Sulphur. By Mr. William Irvine. Cohi- 

 municated by the Author . ^ _ . 4^ 



XI. Strictures on Mr. Dalton's Doftrine of Mixed Gafes, and an Anfwer to 

 Mr. Henry's Defence of the fame. In a Letter from Mr. John Gough 52 



XII. An Enquiry concerning th'e Nature of Heat, and the Modes of its Com- 

 munication. By Benjamin Count of Rumford, V. P. R. S. &c. Abridged 

 from the Philofophical Tranfa6lions for the Year 1804 - 68 



XIII. Experiments and Calculations relative to Phyfical Optics. By Thomas 

 Young, M. D, F. R. S. From the Philof, Tranfaaions for 1804 63 



OCTOBER, 



