The SciencesOn the Influence of the Molecular Grouping in Organic Bodies on their Absorption in the Infra-Red Region of the SpectrumBy W. De W. Abney on June 11, 1881AdvertisementABOUT THE AUTHOR(S)Recent Articles by W. De W. AbneyMonochromatic Images and PhotographyThe Fading of PigmentsPhotometry