CONTENTS 



O F T H E 



EIGHTH VOLUME. 



£HOUGHTS on Colouring, and particularly with a Re fro* 



Jpetl to the Method nfed by the Venetians in the Mechanical 



Part of the Art, and to their Method of Arranging tb* 



Tints - _ _ . p age ^ 



Experiments on the Refrangibility of the invijtble Rays of 

 the Sun - - - _ q 



Experiments on the Solar and en the Terrejlrial Rays that 

 •cca/ion Heat ; with a comparative View of the haws t* 

 which Light and Heat, or rather the Rays which occafiorj, 

 them, are fubjeel, in order to determine whether tbey are the 

 fame, or different. By William Hers ch el, LL.D. 

 F.R.S. - - - 16, 126, 253 



Account of fame interefling Experiments, performed at the 

 London Philofophical Society, refpetling the Effecls of 

 Heat, exciled by a Stream of Oxygen Gas thrown upon 

 ignited Charcoal, on a Number of Gems and other refrac- 

 tory Subflances fubmitted to its Aclion ; with a DefcriptioA 

 of the Apparatus employed - - 21, 263 



An Effay on the Declivities of Mountains. By Richard 

 KlRWAtt, Efq. LL.D. F.R;S. f and Prefident of the 

 Royal Irifb Academy - _ _ 3 o 



On the Identity of the Pyromucorxs, Pyrotartareotts, and- 

 Py'roligneous Acids ; and the Neceffity of not confidering 

 them any longer as dflincl /.cids. By C. Fourcrov 

 WVaUSUELIN - ^ - 40 



Account of a fatal Accident which happened to a Traveller 

 on the Glacier of Buct ; with fome Cautions to tbofe wha 

 through Curiofhy may vifit the Mountains of Swiff erland, 

 and particularly the Glaciers. By Mi A, PicTET, Pro- 

 fefjbr of Pbdofophy - . 53, 109 



Memoir cm the Ibis of the Antient Egyptians, By C. Cu vi£r 



6l 



A brief Examination of the received Dotlrines refpetling Heat 



ar Caloric. By Alexander Tilloch. Read before 



tie AfkefUn Society, December 1799 70, 119, 211 



a A f hart 



