Refers to deposits of nitre in public stores belonging to Wheelen's firm in Frankford. Wheelen thought it was an improper location for such a deposit, causing danger to the other buildings. Wheelen had never even stored salt petre in any of his contiguous buildings. The purveyor stored the nitre there as a matter of convenience with the intention of making it into powder. Neither the purveyor nor Miller anticipated any danger with the nitre in the two years it was stored there.