I

Mix calcined magnesia with purified benzine to a semiliquid paste. Rub the glass with this mixture by means of a cotton wad, until it is bright.

II

Crush to powder cologne chalk, 60 parts, by weight; tripoli, 30 parts, by weight; bole, 15 parts, by weight. For use moisten the glass a little, dip a linen rag into the powder and rub the glass until it is clean.

III

Tin ashes may be employed with advantage. The glass is rubbed with this substance and then washed off with a piece of soft felt. Ill this manner a very handsome polish is obtained.