Be it further enacted, That the common council of said city shall have power and authority to prevent and remove nuisances . . . to provide safe storage of gunpowder . . . .

The Mayor and City Council shall within the limitations of this act have power by ordinance to . . . regulate the storage of gun-powder, tar, pitch, resin, saltpetre, gun cotton, coat oil, and other combustible, explosive and inflammable material . . . .