When the water has become clear, pour it off with care, leaving the sediment behind, then add a fresh quantity of clean water, shake, let settle, and pour off as before.

Repeat the same for several times, and the excess of salt will disappear, leaving the white precipitate, which may be drained of the water and dried in the dark, and kept free from light and air.
CYANIDE OF POTASSIUM.
Cyanide of Potassium .-- This important article is worthy the undivided attention of every Daguerreotypist.

I here give Mr.Smee's process for its preparation.

This is from that author's work entitled, "Electro Metallurgy," American edition: "The cyanide of potassium, so often alluded to while treating of the metallo-cyanides, may be formed in several ways.

It may be obtained by heating to a dull redness the yellow ferrocyanate of potash, in a covered vessel, filtering and rapidly evaporating it.