cyanogen

This is done in an alkaline solution, generally containing cyanogen and ammonia.

I may therefore distinguish two different stages of the theory—my own older autogony-hypothesis and the later cyanogen-hypothesis.

For a connected view of the various compounds of cyanogen employed in the arts, see Prussian Blue.

If cyanogen be given the chance it will take unto itself an atom of hydrogen, producing the deadly hydrocyanic or prussic acid.