Crown Glass

No. 1. Sand, 300 lbs.; soda-ash, 200 lbs.; lime, 30 to 35 lbs.; 200 to 300 lbs. of broken glass. No. 2. (BOHEmian.) - Pure silicious sand, 63 parts: potash, 22 parts; lime, 12 parts; oxide of manganese, 1 part. No. 3. (PROF. Schweiger.) Pure sand, 100 lbs.; dry sulphate of soda, 50 parti; dry quicklime in powder, 17 to 20 parts; charcoal, 4 parts. Product - White and good.

Best Window Glass

No. 1. Take Of White Sand, Fin Lbs.; Purified Pearlashes, 30 Lbs.; Of Saltpetre, 15 Lbs.; Of Borax, 1 Lb.; Of Arsenic, ½ Lb. This Will Be Very Clear And Colorless If The Ingre-Dients Be Good, And Will Not Be Very Dear. No. 2. (Cheaper.)- White Sand, 80 Lbs.; Unpurified Pearlashes, 25 Lbs.; Of Common Salt, 10 Lbs.; Nitre, .5 Lbs.; Arsenic, 2 Lbs.; Manganese, 1½ Oz. No. 3. Common Green Window-Glass White sand, 60 lbs.: unpuri-lied pearlashes, 30 lbs.; common salt, 10 lbs.; arsenic, 2 lbs.; manganese, 2 oz.

Looking Glass Plate

No. 1. Cleansed white sand. 60 lbs.; pearlashes, purified, 25 lbs.; saltpetre, 15 lbs.; borax, 7 lbs. This composition should be continued long in the fire, which should be sometimes strong, and afterwards, more moderate, that the glass may be entirely free from bubbles before it be worked. No. 2 White sand, 60 lbs.; pearl-ashes, 20 lbs.; common salt, 10 lbs.; nitre, 7 lbs.; borax, 1 lb. This glass will run with as little heat as the former; but it will be more brittle, and refract the rays of light in a greater degree. No. 3. Washed white sand, 60 lbs.; purified pearl-ashes, 25 lbs.; nitre, 15 lbs.; borax, 7 lbs. If properly managed, this glass will be colorless.

Window Glass

No. 1. Dried sulphate of soda, 11 lbs.; soaper-salt, 10 lbs.; lixiviated soap-waste,½ bush.; sand, 50 to 60

Lbs.; Glass-Pot Skimmings, 22 Lbs.; Broken Pale Green Glass, 1 Cwt.

No. 2. (Paler)

White sand, 60 lbs.; pearlashes,30 lbs.: common salt, 10 lbs.; arsenic, 10 lbs.; oxide of manganese, 2 to 4 oz.

No. 3. (Very pale.) - White sand, 60 lbs.; good potashes, 25 lbs.; common salt, 10 lbs.; nitre, 5 lbs.; arsenic, 2 lbs.; manganese; 2 to 4 oz. as required; broken pale window-glass, 14 lbs.