“…The PT technique was applied to capillary columns (247) and to the analysis of essential oils with capillaries (518). Merritt and coworkers discussed application of wide range temperature programming to the separation of very complex mixtures (484)• Some observations on quantitation in PTGC have been published in connection with an investigation of the Grignard reaction (639) and Hollingshead and coworkers (298) noted the advantages of PT columns in trace analysis. Hupe and coworkers (307) made an extensive theoretical and experimental investigation of temperature distribution in PT columns and have noted particularly the effect of those gases on this distribution and the resulting effect on column efficiency.…”