excess sodium carbonate from the fusion acted as a spectrographic buffer, and in conjunction with the boiler cap electrode, resulted in a 100% increase in sensitivity. "Moving plate" studies, Figure 2, showed that the volatilization of silicon from the sodium carbonate buffer with boiler cap elec-(6) Ko, R., Appl. Spectr. 13, 10 (1959). ( 7) Snell, F. D., Snell, C. T., "Colorimetric Methods of Analyses," 3rd ed.