China, Glass, &c.

This cement being nearly colourless, possesses advantages which liquid
glue and other cements do not.--Dissolve half an ounce of gum acacia,
in a wineglass of boiling water; add plaster of Paris sufficient to
form a thick paste, and apply it with a brush, to the parts required
to be cemented together.

[AT NIGHT NATURE IS IN MOURNING FOR THE LOSS OF THE SUN.]

2497. Lime and Egg Cement.

Lime and Egg Cement is frequently made by moistening the edges to be
united with white of egg, dusting on some lime from a piece of muslin,
and bringing the edges into contact. A much better mode is to slake
some freshly-burned lime with a small quantity of _boiling_ water;
this occasions it to fall into a very fine dry powder, if excess of
water has not been added. The white of egg used should be intimately
and thoroughly mixed, by beating with an equal bulk of water, and the
slaked lime added to the mixture, so as to form a thin paste, which
should be used speedily, as it soon sets. This is a valuable cement,
possessed of great strength, and capable of withstanding boiling
water. Cements made with lime and blood, scraped cheese, or curd, may
be regarded as inferior varieties of it.

2498. White Lead as Cement.

Cracked vessels of earthenware and glass may often be usefully, though
not ornamentally, repaired by white lead spread on strips of calico,
and secured with bands of twine.

2499. Marine Glue.

In point of strength, all ordinary cements yield the palm to Jeffery's
Patent Marine Glue, a compound of India-rubber, shellac, and coal-tar
naphtha. Small quantities can be purchased at most of the tool
warehouses, at cheaper rates than it can be made. The colour of this
glue, however, prevents its being much used.

2500. Coaguline.

An exceedingly strong, and at the same time a transparent and
colourless cement is made by Messrs. Kay Brothers, of Stockport, and
is sold by most fancy stationers and chemists under the name of
Coaguline. It is easily and quickly applied, and will be found
extremely serviceable in repairing glass, china, and stone articles.
It is inexpensive.

2501. Red Cement .

Red Cement which is employed by instrument makers for cementing glass
to metals, and which is very cheap, and exceedingly useful for a
variety of purposes, is made by melting five parts of black rosin, one
part of yel