TY - JOUR T1 - Photo-Chemical Researches. Part III. Optical and Chemical Extinction of the Chemical Rays JF - Philosophical Transactions of the Royal Society of London (1776-1886) VL - 147 SP - 601 EP - 620 PY - 1857/01/01/ UR - http://dx.doi.org/10.1098/rstl.1857.0030 M3 - doi:10.1098/rstl.1857.0030 AU - Bunsen, R. AU - Roscoe, H. ER -