CONTENTS 



OF THE 



FIFTH VOLUME. 



PART I. 



I. Invejligation of Theorems relating to the Figure of the 



Earth, By Mr Playfair, - - Page 3 



II. Account of certain Phenomena obferved in the Air Vault 

 of the Furnaces of the Devon Iron Works ; together with 

 fome praclical Remarks on the Management of Blajl 

 Furnaces. By Mr Roebuck, - - 31 



III. Experiments on Whin/lone and Lava. By Sir James Hall, 



Bart. - . , . . 4J 



IV. A Chemical Analyfis of three Species of WhinJlone 3 and 



Two of Lava. By Dr Robert Kennedy, - 76 



V. A new Method of Refolving Cubic Equations. By James 



Ivory, Efq; - - - gg 



PART 



