We can irretrievably damage the consciousness by drawing a whiff of cyanogen gas into the lungs, or by sticking a pin into the brain, or by clogging one of its tiny blood vessels with waste matter.
"The Book of Life: Vol. I Mind and Body; Vol. II Love and Society"
Upton Sinclair
And tanks of cyanogen were so arranged that the poison gas could be sent gushing into the cage at any time.
"Stamped Caution"
Raymond Zinke Gallun
The powdered ferrocyanide is then added, together with the colophonium, and the heating is continued until a slight smell of cyanogen is noticed.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose