will allow each scan to be associated with the total ion current observable at the time the scan was obtained. Further, it will allow the intensities observed during a scan to be adjusted for the change in total ion current taking place during the course of the scan itself ( 14). Another benefit of this interface will be the ability of the computer, under program control, to select the appropriate intensity channel and threshold value. (14) C. H. Sederholm, IBM Scientific Center, Palo Alto, Calif., private communication, 1970. ACKNOWLEDGMENTThe authors are grateful to Jack Harten for technical assistance.

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