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Updated: June 8, 2025
Q. I understand you to say you used anhydrous hydrocyanic or cyanhydric acid. A. Yes, sir. Q. Do you sufficiently understand chemistry to use these terms with accuracy? Might you not have used potassium cyanide or prussiate of potash? A. I am a tolerably good chemist, and have spoken understandingly.
Hydrocyanic acid gas, properly used, is also an excellent remedy for aleyrodes, aphides, "mealy-bug," and other soft-bodied insects which are sometimes troublesome on greenhouse tomatoes. For a complete account of the methods of making and handling hydrocyanic acid gas, see Professor Johnson's book entitled "Fumigation Methods," published by Orange Judd Company, of New York. Tomato Diseases
This, Sloggett explained, was the characteristic flame of both cyanogen and hydrocyanic acid vapour, which, being inflammable, may have become locally ignited in the passage over cities, and only burned in that limited and languid way on account of the ponderous volumes of carbonic anhydride with which they must, of course, be mixed: the dark empurpled colour was due to the presence of large quantities of the scoriae of the trappean rocks: basalts, green-stone, trachytes, and the various porphyries.
I washed out her stomach with it, and then my own. Then I injected some of the peroxide into various Parts of her body. The peroxide of hydrogen and hydrocyanic acid, you know, make oxamide, which is a harmless compound. "The maid put Mrs. Boncour to bed, saved. I went to my house, a wreck. Since then I have not left this bed. With my legs paralyzed I lie here, expecting each hour to be my last."
The root of Janipha Manihot, or Manioc-plant, contains a poisonous substance, supposed to be hydrocyanic acid, along with which there is a considerable proportion of starch. The poisonous matter is removed by roasting and washing, and the starch thus obtained is formed into the cassava-bread of tropical countries, and is also occasionally imported into Europe as Brazilian arrow-root.
Sometimes it is morphine or the narcotic principle, that characterises the vegetable milk, as in some papaverous plants; sometimes it is caoutchouc, as in the hevea and the castilloa; sometimes albumen and caseum, as in the cow-tree. The hydrocyanic acid is peculiar to the group of rosaceo-amygdalaceae.
He took from his pocket the package of the bank's securities he had found in the drawer of Forrester's desk, and laid it in silence on the table beside the satchel; beside this again, still in silence, he placed the bottle that had contained the hydrocyanic acid, and after an instant's pause spread out the sheet of note paper bearing Forrester's forged signature.
This salt is said to have no poisonous properties, although the dangerous hydrocyanic acid is made from it. In large doses it occasions, however, vertigo, numbness, and coldness. It is used in various photographic processes. Newton employs it in combination with pyrogallol and soda in the development of bromo-gelatine plates.
"Hydrocyanic acid gas!" exclaimed Marion, forgetting to smoke. "Why, one whiff of that is death!" "It is," agreed Gabriel. "Remember, this is a war of extermination. It's a case of them or us! And if we're worsted, the whole world loses; while if they are, then liberty is born! That's why this gas is justifiable. They'll try to use oxygen-bullets on us, never fear.
On the contrary, he burdened his soul with the, to him, unpardonable crime of falsehood that he might shield Leam from detection; for when his father, missing the sixty-minim bottle of hydrocyanic acid, asked him what had become of it, Alick answered, with that wonderful coolness of virtue descending to sin for the protection of the beloved which is sometimes seen in the ingenuous, "I broke it by accident, father, and forgot to tell you."
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