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If sealing-wax has been used, a sharp, thin blade will enable the medium to nicely cut off the seal by splitting the paper under it; and then, after a knowledge of the contents of the letter is arrived at, the seal can be replaced in its original position, and made fast with gum-arabic. Not more than one out of a hundred would be likely to observe that the seal had ever been tampered with.
He was therefore carrying on a business with the native merchants, from whom he purchased gum-arabic from Kordofan, ivory from the White Nile, hides from the Arabs generally, cotton, and cereals, all of which, as opportunity offered, he either sent down the river or across the Korosko desert to Egypt proper.
On the 5th the urine still passed involuntarily. Cold lotions were employed, and tonic and astringent medicines administered, with castor oil. He gradually got well, and no trace of the disease remained until June the 6th, when he again became thin and weak, and discharged much bloody urine, but apparently without pain. The uva ursi, oak bark, and powdered gum-arabic were employed.
Take 1 oz. of shellac, 1/4 oz. of gum-arabic, and 1/4 oz. of gum copal; bruise them well, and sift them through a piece of muslin, then put them along with a pint of spirits of win into a closely corked vessel, place it in a very warm situation, and shake it frequently every day till the gums are dissolved, then strain through a piece of muslin, and keep it corked for use.
Pound some clean chalk and give it enough water till it be of the consistency of tar, add a proportion of gum-arabic to make it adhesive, then take a camel-hair brush and give the inside of both mandibles a coat; apply a second when the first is dry, then another, and a fourth to finish all. The gum-arabic will prevent the chalk from cracking and falling off.
Some care should be taken not to let the warm finger touch the stone, or it may make a greasy mark that will print. When this initial drawing is done to the artist's satisfaction, the most usual method is to treat the stone with a solution of gum-arabic and a little nitric acid.
These and others, like the Indian malelucas, are remarkable for the Cajeput oil contained in their leaves, and in the gums which exude from their sterns, and in this point of view alone, considering their boundless number, their value can hardly be over estimated. The gum of some of the acacias will bear comparison with gum-arabic.
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