The various mass‐transfer resistances that occur in a packed bed of zeolite granules contribute to the gas chromatographic “C” terms that determine the relative width (or second moment) of a gas chromatographic peak. It was assumed that mass transport in the micropores of the crystallites was independent of the nature of the carrier gas. From measurements with hydrocarbon pulses in hydrogen and nitrogen carrier gases, it was possible by the method of Giddings and Schettler to separate the gas phase resistances from the micropore resistances. Data are given for benzene, n‐octane and (in part) n‐decane on Na × zeolite at 370, 400 and 430°C. Experimental difficulties and precautions are discussed.

completely resolve dimethyl phthalate and dimethyl sebacate, eluted in that order, and could be used for the analysis of compositions containing both these esters, should the need arise.Antarox CO-990 has now replaced polypropylene sebacate because of its lower bleed rate at an operating temperature 40 °C below its maximum of 225 °C, and because of improved separation of triacetin and diacetin. Dimethyl sebacate and dimethyl phthalate, eluted in this order, are not completely resolved by this liquid phase. The results obtained were all within the precision usually expected for gas chromatographic analysis-i.e., ±1% relative.

Program evaluation, as practised by the evaluation community, is seldom performed on research and development (R&D) programs. Scientists and research managers are threatened by formal program evaluation, and therefore do not initiate or support evaluations. This threat is due to three major factors inherent in the scientific community or in organizations in general: the mythology of science, ignorance, and the fear of discovery. The evidence given here suggests that each factor consists of several issues, some being the myth that research programs cannot be evaluated, that managers and scientists do not know about evaluation methods, and that they are afraid of program changes and outside evaluators. The current situation is not expected to change without a fundamental shift within the R&D community itself.