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<p>In the case of solids investigated which have banded emission spectra, the distribution of intensities among the emission bands varies with rise in temperature. The distribution of energy seems to follow a law similar to that of a complete radiator in which the wave-length of max. intensity decreases with rise in temperature. Curves are given showing the relation between the emissivity and the wave-length for various minerals. Talc which was rendered incandescent on a heater tube, as in the previous experiments, gave three sharp emission bands at 2.42 mu 2.75 mu, and 3.35 mu. At about 500 degrees C. the band at 3.35 mu is as intense as the one at 5.4 mu, but at higher temperatures the bands at the lower wave-length become the more intense. By dehydration of
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<br>Subjects: rays and radiation; spectra</div>
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