Bismarck daily tribune. [volume] (Bismarck, Dakota [N.D.]) 1881-1916, 1907-08-15
THE MAKlNGs OF Gil lJE.
Not Definite Organic Substance, but
Product Of Transformations.

Product of Transformations.
" Glue is not a definite, positive or
ganic substance, as most people sup
pose, Chemists tell us that glue does
not pre-exist in any animal organism
except under abnormal condi ions as
In disease but is the product Of sew
eral transformations
Il The first transit ton takes place
in drying the hide. If a green hide is
boiled after being prepared in exactly
the same manner by lining, etc, while
it is yet green, an entirely different
product Of less consistency is secured
than by drying the hide after lining
and then boiling. ,s KS, re- n
The second TRANSIT formation seems to-
take place in boiling the material, prob
ably from action of the heat. The
third transformation occurs in the dry
ing of the jelly secured in the boiling
operation
Still another transformation occurs
in the drying of this jelly into actual
glue, and this series of charges does
not end here, for glue dissolved In
water and again boiled sufficiently
long loses its form once more and
will not gelatinize, but will remain in
liquid form. Il s Is
Glue yielding substances are pro-
duced by the animal economy from
protein bodies, albumen, fbrin and
casein The impossibility of preserv-
ing for any length Of time the stock
from which glue. Is made renders 1t
necessary to adopt some system In
choosing and preserving it until sufi-
Gent quantities are collected without
fermentation or decomp Hence
the refuse from tanneries consisting
Of the clippings of hides, ears and tail
pieces of OK. calf and sheep and from
skins of other animals are preferred
because they can be dressed with lime,
which removes the hair and acts as an
| antiseptic.
The ordinary bone stock glue is made
from the larger bones of cattle and
horn piths, collected from different
sources. a large quantity Of waste
bones is accumulated in the prepare
ton of timed provisions. zsa3
If these have not been overheated
and are in good condition consid era-
BILE amount of glue can be obtained
from them. The bones from the head,
| Ribs and feet give a better yield than
those of the thighs and legs.
There is also the hoof glue, which is
made from the hoofs Of different ami
mails. Then there is glue made from
sinews and feshings, and also grade
known as rabbit glue made from the
skins of hares and rabbits. This glue
makes a good water test, but should
never be used to cement a belt There
\ is large quantity Of this glue made
In this country, and person not very
familiar with 1t could easily be de
Iceived. 5s
The age Of animals yielding glue
4 stock has an important influence on the
product While from younger animals
the production as a rule is of lighter
color, more abundant and more easily
j obtained, 1t contains more chondrin,
so that for solutions Of equal strength
4 those from mature animals will be
4 found to be of the great consistency
and the glue more solid.
Then again there is what is known
as the pig stock glue, which is made
from the feet Of hogs. Next comes the
4 fish glue or isinglass. It's varieties
are numerous, and a thorough knoWl-
4 edge of them can only be obtained
when one Is personally acquainted
i with the different factories and stock
1 from which they are made.
The best Of this material, however
| is made from the sounds or air bad.
ders of the different species Of fish
3 The air bladders of the common stur.
/ geon and other fish caught in northerlJ
8 climates make the best. Wood Craft