1389.] 



On Chemical Tests. 



359 



With Borax, 



With Phosphoric Salt, 



13 Onp: w: clean glass, yel- 

 low hot ; on cooling colour 



14 Clear glass opaque by fl: 



* Fuses with effervescence, 

 with more carbonate s clear 

 glass: crystallizes on cooling. 



15 Clear glass opaque by fl : 



16 On p: w: clear glass in 

 ox : f : on ch : and r: f : glass 

 becomes duty brown, but not 

 opaque. 



17 Ox : f: orange yellow, or 

 reddish glass : becomes yel- 

 low or nearly colourless on 

 cooling. 



18 Onp: w : clear colourless 

 glass, white on cooling on 

 ch: grey and opaque 



19 Fuses with great difficulty ; 

 permanently clear glass. 



20 On p: w: fuses easily; 

 glass colourless, becomes 

 milky white by naming. 

 R. f. glass assumes a dark 

 amethyst colour, but trans- 

 parent. In large quantity 

 on ch : and r : f; glass dull 

 yellow ; when cold, deep blue 



21 Onp: w: and ox : f : clea- 

 glass : not opaque by flamin 



22 Onp: w: dark yellow glass 

 inr: f: becomes dirty green 



23 Clear glass with a large pro- 

 portion of the assay: opa- 

 que by flaming 



24 Ox: f 1 : fuses easily; clear 

 glass, becomes milky by 

 flaming 



Clear colourless glass 



Fuses in large quantity ; £ 

 clear glass 



Fuses with effervescence 



Fuses readily ; clear glass : 

 opaque on cooling if sa 

 turated with magnesia 



On p : w : and ox : f 

 greenish glass while hot 

 colourless cold. In r : f 

 becomes opaque: dull 

 blue, hot: clear fin 

 green on cooling : and on 

 ch : same phenomena. 



fame as with borax, but 

 the colour flies almost 

 wholly on cooling 



Rem, 



With nitrate cobalt an 

 infusible black or grey 

 mass. 



Ditto. 



Flesh colour when quite 

 cold with nitrate cobalt 



Metallic tellurium heated 

 in a glass mattrass first gives off vapour, and 

 grey metallic sublitnat of tellurium. 



then 



In a tube open at both ends, it^ emits abundant 

 fumes, which condense in a whit e fusible powder 

 Same as borax. 



Ox:f: clear; colourless 

 glass. R: f: on ch. glass 

 yellowish, hot: on cool- 

 ing, first red, then 

 very fine blueish vio- 

 let 



Black or greyish black 

 with nitrate cobalt. 



Ox: f: yellowish glass: 

 r: f: fine blue glass. If 

 it contains iron, blood 

 red glass. Tin makes it 

 green or blue 



On p : w: and ox: f : clear 

 yellow glass: cold, straw 

 color, slightly green. On 

 ch : r : f : fine green glass 



Same as with borax 



Nearlv the same as borax 



25 Clear glass with a large pro- Same as with borax 

 portion of the assay: opa-| 

 que by flaming 



With Nitrate cobalt black 

 or dark grey mass 



