An account is given of the authors' preliminary work in the use of highpressure plasmas as both spectrographic and flame-photometric emission sources. Two types of plasma sources are discussed, viz., the d.c.-arc type and the high-frequency induction type ; the latter, having no electrodes, produces little background emission. Tables of the order of detection for some metallic elements are given, but these are not absolute detection limits. The standard deviation obtained with calcium emission a t 3933A is given for both sources.

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The development and properties of inductively coupled plasma sources are discussed and their applications to spectrochemical analysis are reviewed. Comparisons are made with other types of plasma source.

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