CONTENTS. 



Historical Memoranda respecting Experiments intended to as- 

 certain the calorific Powers of the different prismatic Rays 401 



An Essay on the Degree of Warmth of coloured Rays 410 



Experiments tending to prove that the Prism has a calorific 

 Focus, and that Dr. Herschkl was mistaken in supposing he 

 separated the Heat and Light of the Solar Rays . . ATI 



On an ebbing and flowing Stream discovered by boring in the 

 Harbour of Bridlington 432 



On certain Accidents to which Coal-ivorks are liable, particu- 

 larly those of IValer bursting into the Pits from old PVorks 

 that are near adjacent, as recently occurred at Heaton in 

 Northumberland: the accidental Explosions of Fire-damp, 

 setting Fire to the waste Coals in the Works, us happened 

 last Summer at Brora in Sutherland ; and the spontaneous 

 Firing of loose small Coals and pyritic Dirt, ^c. . . 436 



Queries and Observations relating to the Formation of the Su- 

 perficial Part of the Globe 452 



Accident at Newbottle Colliery on the Wear . . . . 4^%^^^ 



On a Contrivance to help defective Vision 461 



On the Electric Cohtmn of Mr. De Luc 466 



On Metallic Salts 463 



On Isochronous Time-Keepers 464 



Notices respecting New Books . . . . . . 63, 139, 366, 46S 



Proceedings of Learned Societies 65, 150,220,303,374,469 



Intelligence and Miscellaneous Articles Ql , 156, 232,314, 386, 



472 



List of Patents 77,158,238,315,397 



Meteorological Table . . . . 80, 160, 240, 320, 400, 473 



THE 



