1839.] On Chemical Tests. 857 



Ch: Charcoal Ox : f: oxidating flame. R : /.* reducing flame. 



With Borax. 



1 Fuses slowly : clear glass Clear glass 



With Phosphoric Salt. 



2 On ch : dissolves freely glass 

 yellowish, hot; nearly colour- 

 less, cold: strong R. f; glass 

 becomes opaque and greyish 



3 The hydrate and carbonate 

 fuse readily with efferves 

 cence into a clear glass which 

 becomes opaque when flam 

 «d 



4 (Oxide) ox : fl : colourless 

 glass, K: f: partly reduc 

 ed: muddy greyish glass 



5 On p: w: yellowish glass, 

 colour flies on cooling. On ch 

 glass bubbles cadmium re- 

 duced, sublimes, and leaves 

 yellow oxide. 



6 Ox, f. fine red, or deep 

 orange yellow glass: colour 

 flies on cooling : cold, yel- 

 lowish tint, enamel white 

 by flaming. In r. f. loses its 

 colour 



7 On cb. fuses difficultly, glass 

 emerald green. On p. w. and 

 ox. f. the colour flies, and 

 glass becomes yellow brown 

 When cold a faint green 

 tinge 



P ; w : and ox: f : glass 

 yellowish, hot: colour 

 flies on cooling. 



As with borax but they 

 foam and intumesce 

 ending in a clear glass 



Remarks. 



Fine blue glass with ni< 

 trate cobalt when cold, 

 strong heat. 



A globule of different 

 shaaes of red which flies 

 on cooling with nitrate 

 of cobalt 



(Oxide), ox: f: yellowish 

 brown glass, hot: 

 lourless but not quite 

 clear, cold. R : f: clear 

 and colourless glass, hot 

 opaque and greyish 

 black, cold 



Dissolves in large quan- 

 tity, clear glass : on 

 cooling milk white 



Ox. f. fine red glass, co- 

 lourless when cold, and 

 quite limpid 



Green glass 



readily, deep blue 



8 Fuses 

 glass 



9 Colourless clear glass be- 

 comes opaque by flaming. 



.0 Ox. f. fine green glass which 

 in r. f. becomes colourless, 

 hot: but cinnabar red and 

 opaque when solid 



1 Clear glass with a large pro- 

 portion of the assay. 



2 Ox. f. dull red glass becomes 

 clear and yellowish or co- 

 lourless by cooling. On ch 

 «md r. f. bluish <;- ; ieen glass 



Fuses readily, deep blue 

 glass. Colour violet by 

 candle light 



Fuses easily, glass per- 

 manently clear 



Ox. f. like as with borax 

 r. f. glass usually red, 

 opaque and like ail ena- 

 mel 



Same as borax 

 Same as borax 



With sub. carb. ©f potash 

 black glass when cold 



Black or dark grey mas? 

 with nitrate cobalt 



