124 ANNUAL OF SCIENTIFIC DISCOVERT. 



ing as the figures thus formed, or atomares, are composed of equi- 

 lateral triangles or squares, the elements are divided into two 

 orders, trigonoids or metalloids, and tetragonoids or metals. Ac- 

 cordinsr to the geometrical outline of the atomare these orders are 

 subdivided into genera ; the species or elements correspond to 

 given values of the variables expressing the geometrical form of 

 the genus. — London Mining Journal. 



WEIGHT VS. SPECIFIC GRAVITY. 



Dr. Lewis Feuchtwanger gives the following table for ascer- 

 taining the weight of a cubic foot of any mineral ore, metal, 

 earth, or any other substance, either native or artificial, from its 

 specific gravity. 



1,728 inches comprise 1 cubic foot, and 1 cubic foot of water 

 weighs at a temperature of 60°F., 62^ pounds avoirdupois. By 

 ascertaining the specific gravity, and multiplying with 62k pounds, 

 the exact weight of 1 cubic foot is obtained. 



Pounds avoirdupois 

 Sp. gr. Cubic foot weighs. 



Anthracite coal, 1.5 .. . 94 



Antimonial copper, tetrahedrite, or gray copper, . 6.0 , . . 300 



Antimonial silver, 9.5 . . . 600 



Antimony ore, gray sulphuret, 4.5 , . . 279 



Antimony metal, 6.5 . . . 400 



Apatite, or phosphate of lime, 3.0 . . . 186 



Arsenical iron pyrites, mispickel, 6.0 . . . 370 



Asbestos, 3.0 .. . 186 



Asphaltum, mineral pitch, 1.0 .. . 62 



Baryta sulphate, 4.5 . . . 310 



Baryta carbonate, Witherhite, 4.0 .. . 248 



Bismuth, 9.7 .. . 600 



Bituminous coal, 1.5 ... 90 



Black lead, graphite, 2.0 . . . 125 



Black jack blende, sulphuret of zinc, 4.0 . . . 250 



Bog iron ore, 4.0 . . . 250 



Brown haematite, 4.0 . . . 250 



Building stones, — granite, gneiss, syenite, etc. . 3.0 . . . 186 



Calamine, 3.3 .. . 190 



Chromic iron, 4.5 . . . 260 



Copper pyrites, 4.0 .. . 260 



Derbyshire spar, fluor spar, ........ 3.0 . . . 186 



Feldspar, 3.0 ... 190 



Flint, 2.5 . . . 110 



Loose sand, — ... 95 



Franklinite, 5.0 .. . 310 



Galena, , 7.5 .. . 465 



Gold (20 carats), 15.7 > , . . 1000 



" pure, 19.25. • to 1200 



Gypsum, 2.3 ... 130 



Iron — cast iron, . . . 450 



" magnetic ore, 5.0 . . . 310 



" spathic ore, 3.0 .. . 200 



" pyrites, 5.0 ... 310 



" pyrrhotine, or magnetic pyrites, 4.5 .. . 280 



" specular iron ore, 4.6 .. . 290 



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