TY - JOUR T1 - The Chemical Composition of Pearls JF - Proceedings of the Royal Society of London (1854-1905) VL - 43 SP - 461 EP - 465 PY - 1887/01/01/ UR - http://dx.doi.org/10.1098/rspl.1887.0168 M3 - doi:10.1098/rspl.1887.0168 AU - Harley, G. AU - Harley, H. ER -