Ghatti

Finders Seekers is the first of a mixed genre trilogy known as The Ghatti’s Tale.

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A mixture containing 93.3 per cent. of this Ghatti and

Scientific American Supplement, No. 821, September 26, 1891 Various

But the new hypothesis, and the experiments undertaken to confirm it, showed clearly that if the viscosity of a gum solution depends on the ratio of metarabin to arabin, then there is no absolute line of demarkation between a Ghatti and a gum arabic.

Scientific American Supplement, No. 821, September 26, 1891 Various

The observation of this fact was one of the circumstances which decided us to use 5 per cent. solutions for the determination of Ghatti gum viscosities, the ratio between the 5 per cent. and 10 per cent. solutions of gum arabics being roughly the same as that between the respective weights required for gumming solutions of equal value.

Scientific American Supplement, No. 821, September 26, 1891 Various

Now to show the use of this: The Z value for a 10 per cent. solution of the second Ghatti at 15° C. is 2,940.

Scientific American Supplement, No. 821, September 26, 1891 Various

Still further, if the insoluble residue of a Ghatti be the residual metarabin over and above that required to saturate the arabin, then it will be possible to dissolve this by the addition of more arabin in the form of ordinary gum arabic.

Scientific American Supplement, No. 821, September 26, 1891 Various

From these observations it would follow, that by taking a gum of less viscosity than the gum arabic previously used to dissolve the Ghatti, less of it would be required to do the same work.

Scientific American Supplement, No. 821, September 26, 1891 Various

Equal parts of a Ghatti and of a gum arabic were ground up together and dissolved in water.

Scientific American Supplement, No. 821, September 26, 1891 Various

From observation of the general nature of the solutions of Ghatti gums, and from the fact that when allowed to stand portions of the apparently insoluble matter passed into solution, the hypothesis suggested itself that metarabin was soluble in arabin, although insoluble in cold water.

Scientific American Supplement, No. 821, September 26, 1891 Various

This latter solution is approaching fairly closely to our "maximum viscosity" with the previous Ghatti, and probably a very slight decrease in the amount of gum arabic would bring about the required increase in viscosity.

Scientific American Supplement, No. 821, September 26, 1891 Various