No. 1. Refined pot-ashes, 60 lbs.; sand, 120 lbs.: chalk, 24 lbs.; nitre and white arsenic, of each 2 lbs.; oxide of manganese, 1 to 2 oz. No. 2. Pure white sand, 120 parts; refined ashes, 70 parts; saltpetre; 10 parts; white arsenic, 1/2 part; oxide of manganese, 1/2 part. No. 3. Sand, 120 parts; red lead, 50 parts; purified pearlash, 40 parts; nitre, 20 parts; manganese, 1/2 part.

Flask Glass (of St. Etienne.) - Pure silicious sand, 61 parts: potash, 3 1/2 parts; lime, 21 parts; heavy spar, 2 parts; oxide of manganese, q. s.

Best German Crystal Glass

Take 120 lbs of calcined flints or white sand; best pearl-ashes, 70 lbs ½ lb.; and 5 oz. manganese. No. 8. (Cheaper.) Sand or flint, 120 lbs.; pearlash, 46 lbs.; nitre, 7 lbs.; arsenic, 6 lbs.; magnesia. 5 oz. This will require a long continuance in the furnace, as do all others when much of the arsenic is used.