by Ernest Clarke, Dictionary of National Biography (1901)
“ Observing the beneficial results upon his own turnip crops at Rothamsted by dressing them with bones dissolved in sulphuric acid, Lawes took out in 1842 a patent, in which he showed how apatite and coprolite and other mineral or fossil phosphates might be converted into a potent manure by treatment with sulphuric acid. He thus laid the foundation for what speedily became and still remains a very important industry, and he was indeed the pioneer of the now very large agricultural manure trade. ”
