CONTENTS. 



XVIIT. Experiments for investigating (he Catise of the co^ 

 loured CQJicentric Rings discovered ly Sir Isaac Nkwton, 

 between two Object-glasses laid upon one another, Bij 

 William Herschel, LLD. F.R.S. .. .. 72 



XIX. Report of Surgical Cases in the City and Finslunj 

 Dispensaries for September 1807. By John Taun- 

 ton, Esq 90 



XX. Proceedings of Learned Societies 91 



XXI. Intelligence and Miscellaneous Articles . . . . 93 



XXII. On Blasting Rocks and Tamping. By John Tay- 

 lor, Esq 97 



XXIII. Extract of a Memoir vpon the Muriatic Ether ^ as 

 read at the French Institute, nth of February, I8O7. 

 By M. Thenard . . , . . . 101 



XXIV. Memoirscf the late Et^asmusDarwin^ M.D. JO9 



XXV. Experiments for investigating the Cause of the co- 

 loured concentric Rings, discovered by Sir Isaac Nkwton, 

 letweeu two Object- glasses laid upon one anothen-. By 

 William Herschf.l, LLD. F.R.S 1I5 



XXVI. Observations upon Sulphureous Mineral Waters. By 

 M. Westrumb . , , , . . ] 291 



XXVII. On the Preparation of' Calomel. By Mr. Joseph 

 Jewel . , , ^ 133 



XXVIII. On the Contraction which takes place in Mercury 

 at low Temperatures by Abstraction of Heat ; — and on the 

 Ratio of Contraction between Mercury, Alcohol, Water y 

 and Silver, ^y John Biddle, Esq. of Birmingham 134 



XXIX. Essay upon Machines in General. By M. Carnot, 

 Member of the French National Institute, '&'c. &c. 154 



XXX. On Caloric, and the Heat evolved during Combustion, 

 By James ScHOLES, Esq., of Ma?ichestcr .. .. 138 



XXXI. On the Cause of the diffei-ent apparent Magnitudes 

 of the same Objects seen under different Circumstances. 

 By Ez. Walker, Esq 163 



XXXII. On the. Identity of S'llex and Oxygen. By Mr. 

 Hume, of Long- Acre, London ., 165 



XXXIII On the public UtiUiy of Medical Insfitutio?is for 

 the Benefit of the Diseased Poor 1 71 



XXXIV. On the constituent. Principles of Potash. By 

 ^Mark Taero, Esq. of Beeston, near Shrewsbury 17*.«J 



XXXV. On the best Means for preventing the fatal Con- 

 sequences that so frequently occur frorn the Dresses of 



^ Females and Children taking fire 1 7 3 



XXXVI. Letter from Sir H. C. Englefikld respecting 

 his Mountain Barometer .. , 176: 



XXXVII. Reports of Surgical Cases in the City and Finsbury 

 Dispensaries, for October 180J -, with some Remarks on 



the 



