Ten sealed glass phials containing coloured liquids for use with a spectroscope to demonstrate adsorption spectra of different materials, in a fitted box for 14 samples, estimated date 1875-1924. Includes three samples labelled Didymium, a substance later found not to exist. (one phial missing on receipt and three containing uranium compounds sent for disposal before accession.) Ten sealed glass phials containing coloured liquids for use with a spectroscope 1875-1924 (estimated)