TY - JOUR T1 - On the Constitution of the Resins JF - Philosophical Transactions of the Royal Society of London (1776-1886) VL - 129 SP - 119 EP - 137 PY - 1839/01/01/ UR - http://dx.doi.org/10.1098/rstl.1839.0010 M3 - doi:10.1098/rstl.1839.0010 AU - Johnston, J. ER -