TY - JOUR T1 - On a Question of Compound Arrangement JF - Proceedings of the Royal Society of London (1854-1905) VL - 12 SP - 561 EP - 563 PY - 1862/01/01/ UR - http://dx.doi.org/10.1098/rspl.1862.0120 M3 - doi:10.1098/rspl.1862.0120 AU - Sylvester, J. ER -