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<p>When molybdenite is heated by thermal conduction or exposed to thermal radiation it exhibits hitherto undescribed thermoelectric, actinoelectric and photoelectric properties. The paper gives precise definitions of these terms. The investigations were divided into three portions under the above headings, and were conducted with molybdenite in the form of thin cleavage pieces, to which were (attached fine copper wires to form the thermojunctions. The method used was similar to that previously recorded [Abstract 1919A00337], and the sample under examination was mounted upon a sliding carriage behind a slit 0.1 mm. wide and 1 cm. long. Thus, by using another slit travelling at right angles to this, any precise spot could be investigated. Light was derived from a tungsten filament%2
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