I. Notes of an enquiry into the nature and physiological action of black-damp, as met with in Podmore Colliery, Staffordshire, and Lilleshall Colliery, Shropshire

Black-damp, sometimes also called choke-damp, or “stythe,” is one of the gases frequently found in the workings of coal mines. It is distinguished from fire-damp by the fact that it is not explosive when mixed with air, but extinguishes flame; and from after-damp by the fact that it is not the product of an explosion, but collects in the workings under ordinary conditions.