Includes combustion and explosion, blasting and mine explosives, fuse, detonators, and electric detonators, firing blasts by electricity, the use of explosives in excavation work, use of explosives in quarrying, use of explosives in metal mining and tunneling, drilling and blasting methods on New York rapid-transit tunnel, magazines and thaw houses, permissible explosives, requirement for bureau of mines tests of metal-mine explosives, safe shipment and storage of explosives, publications on mine accidents and tests of explosives.