perature behavior as well as a very strong influence of pressure on solubility. The smoothed atmospheric pressure results were so low that they could not be plotted on Figure 4.The density results are compared with data for the pure solvents in Figures 5 and 6. As shown, a t low temperatures, the small amount of dissolved solute causes a small decrease in solvent density. As temperature increases, solubility increases, and the density departure becomes larger.

A series of polymers of acrylonitrile with known or calculable number-average degrees of polymerization and molecular-weight distributions have been prepared by (i) bulk polymerization in the presence of triethylamine and (ii) homogeneous solution polymer-