es a beautiful blue color.

* * * * *

BARYTA AND STRONTIA.

* * * * *

Mineral. Heavy-spar

Formula. [.Ba][...S].

Behavior

(1) in glass-bulb. Sometimes decrepitates and gives off more or
less water

(2) in open tube. --

(3) on charcoal. Fuses in the reducing flame.

(4) in forceps. Fuses with difficulty on edges. Colors the outer
flame green. In reducing flame forms BaS, which
fuses readily.

(5) in borax. Gives the baryta-reaction.

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

(7) with carb. soda. Fuses to a clear bead; then spreads out and is
absorbed into the charcoal. The fused mass laid
on silver gives the S-reaction.

(8) Special reactions. If fused with potassa on platinum, gives the
SO^{3}-reaction.

* * * * *

Mineral. Celestine

Formula. [.Sr][...S].

Behavior

(1) in glass-bulb. --

(2) in open tube. --

(3) on charcoal. Fuses to a milk-white bead.

(4) in forceps. Colors the flame crimson.

(5) in borax. Gives the strontia-reaction.

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

(7) with carb. soda. Similar to the preceding.

(8) Special reactions. Similar to the preceding.

* * * * *

Mineral. Witherite

Formula. [.Ba][..C].

Behavior

(1) in glass-bulb. Decrepitates more or less and evolves Water.

(2) in open tube. --

(3) on charcoal. Fuses, effervesces, and is partially absorbed by
the charcoal.

(4) in forceps. Colors the outer flame intensely green.

(5) in borax. Dissolves with effervescence and gives the
baryta-reaction.

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

(7) with carb. soda. Fuses to a clear bead; then spreads out and
passes into the charcoal.

(8) Special reactions. In dilute HCl dissolves with much effervescence.

* * * * *

Mineral. Strontianite

Formula. [.Sr][..C].

Behavior

(1) in g