TY - JOUR T1 - On the Present Position of the Question of the Sources of the Nitrogen of Vegetation, with Some New Results, and Preliminary Notice of New Lines of Investigation JF - Philosophical Transactions of the Royal Society of London. B (1887-1895) VL - 180 SP - 1 EP - 107 PY - 1889/01/01/ UR - http://dx.doi.org/10.1098/rstb.1889.0001 M3 - doi:10.1098/rstb.1889.0001 AU - Lawes, J. AU - Gilbert, J. ER -