obalt if present, and lastly nickel.

(6) in mic. salt. If the residual bead which has been treated with
borax be further treated with microcosmic salt,
the nickel reaction will be obtained and
sometimes a slight copper reaction.

(7) with carb. soda. --

(8) Special reactions. Affords a sublimate of metallic arsenic when
treated with cyanide of potassium.

* * * * *

Mineral. Smaltine

Formula. CoAs.

Behavior

(1) in glass-bulb. When strongly heated generally evolves metallic
arsenic.

(2) in open tube. Gives a crystalline sublimate of AsO^{3}. Also
some SO^{2}.

(3) on charcoal. Gives off fumes of arsenic, and fuses to a dark
grey magnetic bead, very brittle, colors flame
blue.

(4) in forceps. --

(5) in borax. As the preceding, but the cobalt being in large
excess requires some time for its perfect
oxidation, before the nickel reaction is
exhibited.

(6) in mic. salt. Gives the cobalt reaction, and after the cobalt
has been, removed that of nickel.

(7) with carb. soda. --

(8) Special reactions. As the preceding.

* * * * *

Mineral. Glance cobalt

Formula. CoS^{2} + CoAs.

Behavior

(1) in glass-bulb. --

(2) in open tube. As the preceding, but gives off more SO^{2}.

(3) on charcoal. Gives off S and As, and fuses to a magnetic
bead. Colors flame blue.

(4) in forceps. --

(5) in borax. Gives a cobalt and slight iron reaction when
treated as the preceding minerals.

(6) in mic. salt. As in borax.

(7) with carb. soda. Gives a sulphur reaction of silver.

(8) Special reactions. As the preceding.

* * * * *

Mineral. Nickel glance

Formula. NiS^{2} + NiAs.

Behavior

(1) in glass-bulb. Decrepitates and gives an orange colored
sublimate of AsS^{2}.

(2) in open tube. As the preceding.