CONTENTS. 



FEBRUARY 1798. 



]. An Attempt to accommodate the Difputcs among the Chemifts concerning 

 Phlogirton. In a Lciter from Dr. Mitchill of New York, to Jofeph Prieftley, 

 LL.U. F.R.S. &c, &:c. Dated November 20, 1797 — p. 481 



Ignited charcoal urged by the eolipilc. Soppofed combuftion of water. Objcftions to the term 

 hydiogcne — inftrad of which the word phlogi'llon is propoftd. Nomenclatiiie. Prefumption that 

 Mdrogene eiifts in fiilphur, phofphonis, zinc axd iron; — but not as a conftituent part. — Conclufion. 

 Annotations. On the afllon cf llcam from the cohplle. The word phlogifton. Whether the 

 appearance of flame neceffarily indicates the prefcnce of hyJrogenc. Remarks on tlic difference 

 between the functions of D.'. MitchiU's phlogifton and that formerly maintaiaed by Kiiwan. 



II. Experiments on the Compofition and Proportion of Carbon in Bitumens 

 and Mineral Coals. By Richard Kirwan, Efq. F.R.S. L.& E. M.R.I. A. &c. 



p. 487 



Ufcs of mineral coal — On the combuftion of coal — and its decompofition by nitre. The carbon in 

 mineral coals is proportioned to the nitre deconipofed by equal quantities of each. Analytic 

 courfe grounded upon this fact. Kilkenny coal. Table of Kirwan's-Numbcrs ufcd to diftinguifh 

 the luure, tranfparency, frafture and hardnefs of minerals. Maltha. "Afphalt. Canncl coal. 

 Slaty Cannel coal. Whitehaven coal. Wigan coal. Swanftycoal. Leitrim coal. Ncwcaftle coal. 

 The refults tabulated. 



III. Obfervations on the beft Methods of producing artificial Cold. By Mr. 

 Richard Walker — — — — p. 497 



Preparation of ice in powder. Congelation of mercury in a few minutes where the air is not hotter 

 than 85^. Cheaper piocefs. Tabic of freezing mixtures, and the cold produced by them. 

 Various repetitions of the experiments. Freezing by ether. Dcfcriptions of the apparatus ufed 

 in the preceding experiments. 



IV. The Dcfcription of a new portable Eledrical Machine. Invented by the 

 Rev. W. Pearfon of Lincoln — — — p. 506 



Dcfcription and ufc of the machine. Eilimate of its power, &c. 



V. A Memoir concerning a remarkable Phenomenon in Meteorology. Read to 

 the Society of Naturahfts of Geneva. By M; de Sauflure, OAober 1797. 



p. 511 

 Times of greatcft drynefs are the precurfors of rain. Explanation of the caufc. 



VI. On the various Denominations given to the Alkali of Tartar. By a Cor- 

 refpondenc — — — "~ P- 5'o 



Remarks on the terms kali, fixed vegetable alkali, potafti, fpodium and tartarin. Preference given 

 ^to the Uft. 



VII. An 



