CONTENTS. 



XIX. Experiments on the solar, and on the terrestrial Rays 

 that occasion Heat ; with a comparative View of the Laws to 

 which Light and Heat, or rather the Rays which occasion them, 

 are subject, in order to determine whether they are the same, 

 or different. Part II. By William Herschel, LL. D. F. R. S. 



Page 437 



XX. An Account of the Trigonometrical Survey, carried on in the 

 Tears 1797, 1798, and 1799, by Order of Marquis Cornwallis, 

 Master-General of the Ordnance. By Captain William Mudge, 

 of the Royal Artillery, F. R. S. Communicated by his Grace 

 the Duke of Richmond, F. R. S. p. 539 



