CONTENTS. 



Communicatio7ifrom Mr. J. Allan respecting his improved 

 Dividing F.ngine, for which he received the Gold Medal 



of the Society of Arts, &c .. .. 383 



An Account of' some Experiments on different Combinations 



tf Fluoric Acid 374 



A Description of a new Instrument for facilitating the Na- 

 vigation of Ships at Sea, called " The Marine Transit." 



401 



Further Experiments and Olservations on the Influence of 



the Brain on the Generation of Animal Heat . . 405 



On a nerv (Economical Lamp 416 



On sorne Combinations of Phosphorus and of Sulphur, and 



on some other Siiljects of Chemical Inquiry. .. 41/ 



On the Construction and Effects of the Pneumatic Tinder- 



Box 424 



Notices respecting Neio Books . . , . 145, 297, 386, 434 

 Proceedings of Learned Societies 59, 151, 231,308, 387, 453 

 Intelligence and Miscellaneous Articles 66, 151, 236, 315, 



394, 468 



List of Patents 76,158,239,319,398,471 



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



THE 



