Copy 1

The chemical pocket-book, or memoranda chemica; arranged in a compendium of chemistry ... with Bergman's table of single elective attractions / as improved by Dr. G. Pearson.

  • Parkinson, James, 1755-1824
Date:
1800
Catalogue details

Licence: Public Domain Mark

Credit: The chemical pocket-book, or memoranda chemica; arranged in a compendium of chemistry ... with Bergman's table of single elective attractions / as improved by Dr. G. Pearson. Source: Wellcome Collection.

    177/274 (page 159)
    ae a | and water, which is kneaded and wrought in the: hands, under water, till it no longer communicates ‘any colour to that fluid. The substance which then ‘remains i in the hand, is tenacious, duétile, and very, ‘elastic ; and becomes more and more adhesive, in ‘Proportion as the water it had imbibed flies off by Bes stsuss ; if stretched out and let-go, it returns by contraction to its former shape. During the ‘operation the feecula falls to the bottom of the water, and the extractive matter remains in solution. ie The glutinous: matter emits a very characteristic animal smell. Its taste is insipid, it swells up) pon hot coals, becomes soon and perfeétly dry in adry air, or bya gentle heat, in which state it re~ embies clue, and breaks short like that substance. in this state it be placed on burning coals, it curls’ IPs is agitated and burns. like an animal substance. By distillation it affords the carbonate of ammoniac, and shews in several instances a very decided animak Character. Fresh made gluten, exposed to the air, readily pu- trifies, and when it has retained a small quantity of Starch, this last passes to the Acid fermentation and ae the putrefaction of the gluten: in this way State is produced resembling that of cheese. Cald Water does not attack this glutinous part; but a: be boiled with this fluid, it loses its extensibility d adhesive quality: it also loses its elasticity jand glutinous quality by drying. Alkalis dissolve S Pz it,