Plate, figures 1-9 showing plant pots, pans, and stoneware lutes and an apparatus for decomposition of nitrogenous organic matter by unknown artist Figures 1-9 from plate XII showing plant pots and pans, stoneware lutes, an apparatus for decomposing nitrogenous organic matter, a glass vessel, and part of a plant. Subject: Botany Published in Philosophical Transactions as 'On the sources of the nitrogen of vegetation; with special reference to the question whether plants assimilate free or uncombined nitrogen'. Received and read by the Royal Society on 21 June 1860. [1860]