CONTENTS. 



tetter to the Right Honovralle the Countess of Gosford, on 

 the SimilHude, and' Difference, in the original Formation 

 of the Island of St. Helena, and the Basaltic Districts in the 

 Conntj/ of Antrim ; tailh the Similitndes and Differences of the 

 posterior Operations of Nature performed upon each. 246 



On the Excitement of Foltaic Plates . . . . 255 



Essay on Ai^ricnlture, as a Science, subdivided into separate 

 Depnrtmf-nls. 262 ' 



Extract from a Memoir on the Combinations of Phosphorus 

 with Oxygen. .. ,. ., .. .. 271 



A new View of Vegetahle Life. . , . . , . 27S 



On Sir Humphry Davy's Safe- lamp, and on Flame, 286 



Abstract of a Memoir by M. Lkopold de B0CH on the Limits 

 of the perpetual Snoivs in the North. . . . . 289 



On Cast Iron and Steel ; ivith Experiments to ascertain whether 

 Manganese may be alloyed with Iron. . , . . 295 



On Planetary Influences on the Atmosphere. . . . . 321 



Some Observations on the Salt Mines of Cardona, made during 



(1 Tour in Spai?i, in the Sumrner of \S14. . . . . 325 



Observations on some Combinations of Azote with Oxygen. 331 



Experiments and Ob'iervaiions to prove that the beneficial 

 Effects of many Medicines are produced tlirough the Medium 

 of the circulating Blood, more particularly that of the Col- 

 chicum autumnale upon the Gout. . . . . . . 337 



An Appendix to a Paper on the Effects of the Colchicum au- 

 tumnale on Gout. . . , . . , . . , . 340 



On the Action of detached Leaves of Plants. . . . . 345 



Controversy respecting Safety-lamps. , , .. 348 



On Vision. . . . . . . . . . . . , 353 



Ofi the Possibility of alloying Iron with Manganese. 354 



On Flame 360 



On the Circle , . . . , 362 



On the Origin of the Atomic Theory 363,408 



Observations rf the late Sular Eclipse. . . 371, 440, 442 

 Inquiries into the Laws of Dilatation of Solids, Liquids, and 

 elastic Fluids, and on the exact Measurement of Tempera- 

 tures. 373, 442 



Op, the Physiology of Vege tables. . . '. . . 401 



An Account of the Discovery of a Mass of Native Iron iuBrasiL 



417 



