Heats of mixing and densities of very dilute aqueous solutions (mol fraction concentration << 2 x of cyclic ether derivatives have been measured at several temperatures. The solutions studied included tetrahydrofuran, tetrahydropyran, 1,6dioxan, tetrahydrofurfuryl alcohol, and tetrahydropyran-2-carbinol. Limiting partial heats, heat capacities, volumes and expansibilities are discussed in terms of current ideas on polar and apolar hydration.

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Abstract. The use of Research Planning Diagrams as an aid for project planning and evaluation is described. A computerized simulation technique for the analysis of the probabilities associated with a diagram is illustrated by means of a worked example.