yi CONTENTS. 



PAQB 



Iron assay 52 



Sulphate of copper, 53 



Chalcopyrite .53 



Sphalerite, or blende 55 



Smithsonite 57 



Brass 58 



Oxides of manganese, iron, and zinc . . . . .59 



Cadmium and zinc . . 60 



Cadmium and copper ........ 60 



Galenite . . .'*".' 61 



White lead V '. ". . . '.* . . .62 



Pyromorphite . . . . . . . . . 63^ 



Silver and lead . . . . . . . . ~ 65 



Silver and copper ........ 66 



Silver assay .... " .^ . . .. . 67 



Gold and copper ^ . . '._",'. ' . . . 68 



Gold and silver .' f . . 69 



Amalgams .......... 70 



Mixtures of protoxide of mercury, minium, and cinnabar . 72 



Tin and copper . 72 



Tin and lead 73 



Bismuth, lead, afid tin 74 



Bismuth and copper 76 



Schweinfurt green 76 



Arsenic and lead 77 



Arsenic and tin . .78 



Tartar-emetic 80 



Antimony and lead 80 



Bournonite . 82 



Zinkenite >. .. ... 83 



Berthierite . ... . . 84 



Ked silver-ore , ? .84 



Tin and antimony .... . ;" " 87 



Arsenic and antimony ... V V '.. . 88 



Arsenic, antimony, and tin . . . "./.*.". 90 



Tetrahedrite . 91 



