An Act amending the act of July 1, 1937 (P. L. 2681, No. 537), entitled "An act relating to, and regulating the manufacture, storing, and possession of explosives; requiring permits for magazines, and prescribing permit fees; and providing penalties," exempting the storage of certain explosives from regulation by the department and requiring certain quantities of explosives in commercial establishments to be stored in specified magazines and imposing a penalty.