The Encyclopaedia Britannica: a Dictionary of Arts, Sciences, And General ... 11
The Encyclopaedia Britannica: a Dictionary of Arts, Sciences, And General ... 11
T Spencer Thomas Spencer Baynes
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Graham {Ckanical and FhyBieal JU- ^M) gives dialysis as the simplest and beat mode of preparing gummio acid, and states that the power of gum to penetrate the eoUoid septum is 400 times lesS thsn that of cUoride of sodium, and further that ht mixing the gum with substances of the crystalloid dass tho diflnaibility is lowered, and may be even reduced to nothing. The mucilage must be acidulated with hydrochloric acid before dialjsing, to set free the gummio acid. Gummic acid reddens Htmus, its re...action being about equal to carbonic acid. When eolations of gum araUo and gelatin are mixed, oily drops of a compound of the two are precipitated, which on standing form a nearly oolouriess jelly, melting at 25* a , or by the heat of the hand. This substanoe can be waahed without decomposition. Gummio sdd is sohihle in water ; when well dried at 100* C, it becomes transformed Into metagummio acid, whieh is insoluble, hot swells up in water like gum tragacanth. Gum arabic, when heated to 160* 0.
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