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THE arc spectra of neodymium and samarium were photographed with a large concave grating spectrograph, the photographic plates being suitably sensitized to record the spectra from the green to the infra-red.
About 1500 lines were measured in each spectrum, most of them being of low intensity.
No bands were observed in either spectrum, although a few unsymmetrical lines may be regarded as band heads. About 125 lines common to both spectra have been segregated into a separate table. These lines may be characteristic of the element of atomic number 61 which comes between neodymium and samarium, but which has not yet been isolated.
The materials used for the work were neodymium oxalate and samarium oxide prepared at the University of Illinois and samarium oxalate prepared at New Hampshire College. This work is a continuation of a study of the spectra of the rare earth elements of which a first report is given in B. S. Scientific Papers, No. 421.
WHITE FLOATING SOAP.
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