"Government officials had the power to scrape up dried urine from beneath the boarded floors of Stuart stables because it contained saltpetre, a vital ingredien

"Government officials had the power to scrape up dried urine from beneath the boarded floors of Stuart stables because it contained saltpetre, a vital ingredient of gunpowder." http://findarticles.com/p/articles/mi_m0PAL/is_/ai_n15630934 http://findarticles.com/p/articles/mi_m0PAL/is_/ai_n15630934