sturgeon.

Liquid glue may be made either from animal or fish glue. The LePage
liquid glue is made in Gloucester, Mass., one of the greatest fish
markets in the country. Liquid glue is very convenient because always
ready, but is not so strong as hot glue, and has an offensive
odor. Liquid glues are also made by rendering ordinary glue
non-gelatinizing, which can be done by several means; as, for
instance, by the addition of oxalic, nitric, or hydrochloric acid to
the glue solution.

To prepare hot glue, break it into small pieces, soak it in enough
cold water to cover it well, until it is soft, say twelve hours, and
heat in a glue-pot or double boiler, Fig. 243, p. 148. The fresher
the glue is, the better, as too many heatings weaken it. When used it
should be thin enough to drip from the brush in a thin stream, so that
it will fill the pores of the wood and so get a grip. Two surfaces to
be glued together should be as close as possible, not separated by a
mass of glue. It is essential that the glue be hot and the wood warm,
so that the glue may remain as liquid as possible until the surfaces
are forced together. Glue holds best on side grain. End grain can be
made to stick only by sizing with thin glue to stop the pores. Pieces
thus sized and dried can be glued in the ordinary way, but such joints
are seldom good. Surfaces of hard wood that are to be glued should
first be scratched with a scratch-plane, Fig. 111, P. 79.

To make waterproof glue, add one part of potassium bichromate to fifty
parts of glue. It will harden when exposed to the air and light and be
an insoluble liquid.[8]

[Footnote 8: For recipes for this and other glues, see Woodcraft,
May '07, p. 49.]

_General directions for gluing._[9] Before applying glue to the
parts to be fastened together, it is a good plan to assemble them
temporarily without glue, to see that all the parts fit. When it is
desirable that a certain part, as the panel, in panel construction,
should not be glued in place, it is a wise precaution to apply wax,
soap, or oil to its edges before insertion. Since hot glue sets
quickly, it is necessary after the glue is applied to get the parts
together as soon as possible. One must learn to work fast but to keep
cool. To expedite matters, everything should be quite ready before the
process is begun, clamps, protecting blocks of wood, paper to protect
the blocks from sticking to the wood, braces to straighten angles,
malle