Note 87 — I. Preservation of Objects composed of Inorganic Substances.

Though some other kinds of burette may be easier to use, that here recommended (that of Gay-Lussac) is the most convenient for reasons into which we need not enter. The following precautions should be observed: where the burette is not closed by a cork, let a few drops out first to wash away crystals of silver nitrate which may have formed at the mouth. The silver solution should be kept in well stoppered bottles. When filling the burette a glass funnel should be used, so that the cork used for closing the burette is not wetted with the silver solution. Before reading off wait until the level of the fluid is constant, in order that any solution on the sides of the glass tube may have time to run down.