ying in the mouth of the vessel, use a tin vessel with
the cover fitting tight on the outside to prevent the escape of the spirit
by evaporization. A strong solution of isinglass made in the same manner
is an excellent cement for leather.

A valuable glue is made by an admixture with common glue of one part of
acid chromate of lime in solution to five parts of gelatine. The glue made
in this manner, after exposure, is insoluble in water, and can be used for
mending glass objects likely to be exposed to hot water. It can also be
made available for waterproofing articles such as sails or awnings, but
for flexible fabrics it is not suitable. A few immersions will be found
sufficient to render the article impervious to wet. It is necessary that
fractured articles should be exposed to the light after being mended, and
then warm water will have no effect on them, the chromate of lime being
better than the more generally used bichromate of potash.

POSTAGE STAMP MUCILAGE.

Postage stamp mucilage can be made by dissolving an ounce of dextrine in
five ounces of hot water, and adding one ounce of acetic acid and one
ounce of alcohol. The dextrine should be dissolved in water in a glue pot,
or some similar vessel, which will prevent burning. The quantities in this
recipe may be varied by taking any required weights in the proportions
mentioned. Dr. Phin says that dextrine mixed with water makes a good label
mucilage if a drop or two of glycerine be added to it. Too much glycerine
will prevent the mucilage drying; with too little it will be likely to
crack.

HOW TO KEEP MUCILAGE FRESH.

To keep mucilage fresh, and prevent the formation of mould, drop into the
bottle a few crystals of thymol, which is a strong and harmless
antiseptic.

MUCILAGE IN A SOLID FORM WHICH WILL DISSOLVE IN WATER.

Mucilage in a convenient solid form, and which will readily dissolve in
water, for fastening paper, prints, etc., may be made as follows:--Boil
one pound of the best white glue, and strain very clear; boil also four
ounces of isinglass, and mix the two together; place them in a water
bath--a glue pot will do--with one-half pound of white sugar, and
evaporate till the liquid is quite thick, when it is to be poured into
molds, dried, and cut into pieces of convenient size.

MUCILAGE FOR PASTEBOARD.

Persons are often at a loss for a very strong mucilage having sufficient
power of tenacity to fasten sheets of pasteboard together. T