Sec. 40. No person shall keep in any building or place within the city, excepting in such magazine or place of storage as may be provided by or under the direction of the city council, any greater quantity than twenty-five pounds of gunpowder, nitro-glycerine or other like compound for a longer period than twenty-four hours. No person shall keep any gunpowder, nitro-glycerine or other like compound except in said magazine, unless it be placed and kept in safe metal, glass or stone canisters. No person shall, by artificial light, weigh or sell gunpowder in bulk, or in any other manner than by tight metal, glass or stone packages.