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Updated: June 16, 2025
This is the process he adopted : The fat or tallow is first boiled with quick-lime, and made into a soap, and then the soap is decomposed by sulphuric acid, which takes away the lime, and leaves the fat re-arranged as stearic acid, whilst a quantity of glycerin is produced at the same time.
At noon we conquered the last impediment we stood at last upon the summit, and without the loss of a single man except the mule that ate the glycerin. Our great achievement was achieved the possibility of the impossible was demonstrated, and Harris and I walked proudly into the great dining-room of the Riffelberg Hotel and stood our alpenstocks up in the corner.
Up came the oil, spouting and running over, gushing out and streaming down to a little river that ran near by. Now those of us who have kerosene lamps may thank the oil-wells that were prepared for us so many years ago. When your hands or lips are cracked and rough from the cold, does your mother ever put on glycerin to heal them?
Silk dissolves completely in hot basic zinc chloride solution, and also in an alkaline solution of copper and glycerin, which solutions do not dissolve vegetable fibres or wool. Chlorine and bleaching-powder solutions soon attack and destroy silk, and so another and milder agent, namely, sulphurous acid, is used to bleach this fibre.
Where a bilateral affection exists, two or three weeks' time should intervene between the treatments of each leg. A sterile metal syringe equipped with a slip joint for the needle is well adapted to this operation. Lubrication of the plunger with heavy sterile vaseline or glycerin will prevent the syringe from being ruined by the iodin.
Glycerin absolutely a sugar, or a substance similar to sugar comes out of the tallow in this chemical change.
To relieve the pain, warm fomentations or lead and opium lotion should be applied. Later, ichthyol-glycerin, or glycerin and belladonna, may be substituted. When, at the end of three weeks, the danger of embolism is past, douching and gentle massage may be employed to disperse the œdema; and when the patient gets up he should wear a supporting elastic bandage.
When these fats and oils, often called glycerides, are heated with alkali, soda, a true salt of the fatty acid and soda is formed, and this is the soap, whilst the glycerin remains behind in the "spent soap lye." The mixture of soap and glycerin produced from the fat and soda is therefore treated with brine, a process called "cutting the soap."
There, covered with the water, it gently swirled and curdled, with strange metallic glints and oily sheens, as Beatrice with a gold spoon stirred it at the engineer's command. From moment to moment he dropped in a minute quantity of glycerin, out of a glass test-tube, graduated to the hundredth of an ounce.
I took the glass pencil in my hand, moistened the point in the glycerin, and held it out to the animal, which licked it with her long red tongue. I did this three or four times, but the next time I dipped the pencil in the acid. The cat unhesitatingly touched it with her tongue.
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