Till CONTENTS. 



SUPPLEMENT. 



Engravings of the following Objefts ; I, 2, J. Three Qiiarto Engravings, con- 

 taining the Apparatus and Subjefts of Sir James HalTs Experiments upon 

 the Effefts of Heat modiiied by Comprefllon ; 4. The Efcapcment of Eain- 

 fliaw's Time-Piece, for which the Conmiiflioners of Longitude voted a Re- 

 ward of JOOO/. 



I. On the Saline Efflortfcences upon Walls; Salivary Concretions; Deflagration 

 of Mercury by Galv;^Miiin; Biliary Calculi ; and the freezing Point of Sper- 

 maceti, By John Bollock, M, D. - . _ Page 373 



II. Inveftigation of the Temperature at which Water is of greateft Denfity, 

 from the Experiments of Dr. Hope on the Contraftion of Water by Heat at 

 low Temperatures. In a Letter from Mr. John Dalton. - - 311 



III. Account of a Series of Experiments, fhewing the Effects of Comprefllon 

 in modifying the A«tion of Heat. By Sir James Hail, Bart, F. R. S. Edin- 

 burgh. - - - - - - 381 



IV. Obfervations on the Effeft of Madder Root on the Bones of Animals. By 

 Mr. B. Gibfon. ^ - - - - - 40(i 



V. On Fairy Rings and the Wafte of Fifli in Scotland. By A. T- - 415 



VI. Letter from Amicus relpefting the fuppoled Wafte of Crab-Fifli in Scot- 

 land. - - - - - - 417 



VII. Probability that the Hindoos were acquainted with Saturn's Ring. 418 

 VIIL Explanation of Time-keepers conihii6ted by Mr. Thomas Earnfhaw; 



for which a Reward of Three Thouland Pounds was awarded by the Commif- 

 fioners of Longitude. From the Communications made by him to the Com- 

 milTioners. -~ - - - - 419 



IX. Experimental Enquiry into the Proportion of the feveral Gafes or Elaftic 

 Fluids, conftituting the Atniofphere. By John Dalton. - 430 



X. Obfervation which indicates a fponianeous Decompofition of Nitrous Acid 

 and Formation of Ammonia. By D. A. - - - 433 



Scientific News, 410.- Note on the Porcelain of Reaumur. Communicated by 

 Veau de Launij ib. — 



TO THE BINDER. 

 The three Targe folding Plates numbered Plate 1, PI. 2, and PL 3, «i- 

 grazed from Tranf. R. S, are to be placed along with Plate 13. There 

 are no Plates numbered 9, 10, II, 12, thefe three Quartos fupplying 

 their Place. 



