| http://www.w3.org/ns/prov#value | - Here, organic chemistry presents the highly significant fact, that cyanogen and its compounds, such as potassium cyanide, ammonium cyanide, hydrocyanic acid, cyanic acid, etc., arise only in an incandescent heat e.g., when the necessary nitrogenous compounds are brought in con-tact with burning coal, or when the mass is heated to a white heat.
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