a gummy substance derived from various low, spiny, Asian shrubs belonging to the genus Astragalus, of the legume family, especially A. gummifer: used to impart firmness to pills and lozenges, stiffen calicoes, etc.
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Further examination indicated the presence of salicylic acid, a gummy material, having the properties of tragacanth and glycerin.
It is not well in most cases to fasten the shells on card, but if this is done gum tragacanth is best.
In such cases a little spirits of camphor mixed with the gum tragacanth is best.
A shallow trough is filled with a solution of gum hog or gum tragacanth of the consistency of thick cream.
The following is a good one: Make a paste of gum tragacanth and add a little oil of wintergreen.