1. Protochloride of Tin. To strong hydrochloric acid, add gradually small pieces of grain tin till no more is dissolved. It may be obtained in crystals by evaporation. In redissolving them, it is necessary to add to the water a few drops of hydrochloric acid.

2. Nitro-muriate, or Perchloride of Tin. Mix 1 measure of nitric acid with 4 of hydrochloric acid, and add tin in small quantities as long as any is dissolved. Or mix 4 oz. of hydrochloric with 1 of nitric acid and 1 of water; dissolve in it, by small portions at a time, 2 drachms of grain tin.

3. Aqua fortis (or equal parts of nitric acid and water) 8 parts, sal ammoniac 1 part; mix, and add gradually 1 part, or as much as it will dissolve, of grain tin.

4. Dr. Bancroft's Murio-sulphate of Tin. Digest 2 parts of tin with 3 of strong hydrochloric acid for an hour. Add very cautiously 1 1/2 part of oil of vitriol. Keep up the heat as long as hydrogen is evolved; on cooling, it crystallizes. Dissolve this salt in water, so as to form a solution containing 1 part of tin in 8.

5. New Tin Crystals. Add 3 lbs. of sal ammoniac to a gallon of solution of tin; evaporate, and crystallize.

6. Mordant for Lac Dye. Mix 27 lbs. of hydrochloric acid with 1 1/2 lb. of nitric acid (sp. gr. 1.19), put it into a stone bottle, and add tin in small bits till 4 lbs. are dissolved.

7. Stannate of Soda. Digest litharge 36 parts, or minium 27 parts, in a metallic vessel, with a soda ley of 135 dens.; when dissolved, 8 parts of tin in grains are gradually added. The lead separates at once in a 6pongy state, and the solution of stannate of soda may be decanted.

Lac Spirit, used as a Solvent for lac dye, in preference to hydrochloric acid alone, is thus made: Add gradually 3 lbs. of tin to 60 lbs. of hydrochloric acid. Digest 3/4 lb. of this solvent on each pound of the dye for 6 hours. Plum or puce spirit, peach spirit, and grain or scarlet spirit, are names given by dyers to different solutions of tin employed in dyeing these colours. For scarlet, the nitro-hydrochloric solutions (Nos. 2 and 3, above) are used.