The grinding of glass on a flat stone with sand or emery, and water, is often useful in making a bottle stand steadily; and by its means a wine-glass with a broken foot may be turned to good account; for if as much of the stem as possible is knocked off, by striking it with the back of a knife, the remainder may be ground away so that the vessel will stand. One of the most important Domestic Manipulations, although one of the most simple and easy, is the labelling of glass vessels. It is not too much to affirm, that scores of lives might have been saved if this had been attended to; in cases of accidental poisoning, we usually find that the victim has drunk from some bottle which has been put away without a label; and thus some corrosive liquid used for cleaning, or some poisonous lotion, has been inadvertently swallowed. One of the most ready modes of labelling glass, and other objects, consists in having at hand a sheet of paper, which has had spread on one side some gum water, mixed with half its weight of coarse brown sugar, and allowed to dry; this may be cut into labels, written on, and readily attached to glass by moistening with the tongue; the white margin of a sheet of postage stamps answers the purpose very well. If, however, acid liquids are used, or the vessel is placed in a damp situation, as a cellar, other means must be had recourse to. With a little practice it is easy to write in a legible, though not very conspicuous manner, on glass, with a gun-flint, or with the sharp-edged fragments of common flint. In the laboratory what is called a _writing_ diamond is used for this purpose; this should not be confounded with a glazier’s diamond, which is used for dividing, and not scratching glass. We would here caution our reader against writing on glass with a diamond ring, &c., as the practice injures the jewel considerably; in the glazier’s diamond, the natural edges of the crystal are used, which are not liable to injury as are the cut angles of a brilliant.