CONTENTS. 



j4n Jcccmil of so?nc Experimetits with a large Voltaic Bat- 

 tery .. ..409 



On the Elasticity of Fluids. .. .. .. .. 416 



On the supposed Diminiilinn of Volume tvhich IVater at 32" 



undergoes by Addiiions of Temperature till it reaches 4 1°. 417 

 On the Solubility of alkaline and earthy Salts, as affected by an 



Excess of the uicid. .. ", . .. .. .. 419 



Experimevts in. Voltaic Electricity. .. .. .. 421 



On the Ulion of Acids on the Salts vsnally called Hyper- 

 oxymuriates, and on the Gases produced Jrom them. 426 



On the Nature ami Comhrnalions of a newly -discovered vege- 

 table ylcid ; u'ilh Ohiervalions ou the malic Acid, and Sug- 

 gestions on the State in which Acids may have previously 

 existed in Vegetables. . . . . . . . . 433 



On the Fire-dav}p of Coal-Mines, and on Methods of lighting 

 the Mines so as to prevent its Explosion. . . . . 444 



On Safe- Lamps for Coal-Mines; 7i'ith a Description of the 

 one invented by Mr. Stephenson, of KilUngworth Collien/. 



4o8 



On Wooi.f's Steam- Engines; luith Certificates of their Per- 

 formance, from the Managers of the Mines in Cornwall 

 u/here they are at work. . . . . . . . . 460 



On the I Vork performed by Steam- Engines in Cornwall luith 

 each Bushel of Coals. . . . . . . . . 462 



On Boilers employed to produce Steam of Higli Pressure. 464 



Notices respecting New Books. 68, 145, 230, 312, 375,471 



Proceedings of Learned Societies 387,466 



Intelligence and Miscellaneous Articles. 69, 150, 230, 3 13, 390, 



469 



List of Patents 75, 237, 23S 



Meteorological Table SO, 160, 240, 320, 400, 4/3 



THE 



