CONTENTS. VU 



Page 



Proceedings of the Royal Geological Society of Cornwall 457 



Method of purifying Crystals 460 



Decomposition of Cyanate of Silver by Sulphuretted Hydrogen 46 1 



Analysis of Tymp Cinder 463 



Spontaneously Inflammable Metallic Powders 464 



Precipitation of a Metal from Solution by other Metals .^ 465 



Bitberg Meteoric Iron . , 466 



Note on Female Pheasants assuming the Male Plumage 466 



Remarkable Rainbow 469 



The Moon and its Inhabitants * 469 



Transmission of Sound 470 



Unprecedented Cold 470 



The Heat of July, 1 825 470 



New Scientific Books 471 



New Patents 47 1 



Mr. Giddy's Meteorological Journal 472 



Mr. Howard's Meteorological Journal 473 



Index , ,...,0 475 



PLATES IN VOL. XIL (New Series.) 



Plates Page 



XL* — Mr. Christie on the Magnetism of Iron arising from its Rotation. 28 



XLI.— Mr. Sturgeon's improved Electro-magnetic Apparatus 359 



Hyn-;>f 



