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The Thermal Isomerization of Neoabietic Acid 1497 Table I Comparison of the Effects of Additives on the Retrogradation Rate of Corn Amylose. Basis of Comparison Is the Time Required to Reach the Inflection Point on the JBC-Age Curve Amylose concentration = 0.1%; temperature = 3 + 1°T ime, Time,

T he naval stores industry of today produces three types of rosin-gum rosin, wood rosin, and tall oil rosin. The production pattern of the last few years places each rosin in an important commercial position, as figures for 1955-56 indicate: The wood naval stores industry produced 712.000. 000 pounds of rosin, the gum naval stores produced 236.000. 000 pounds, and crude tall oil production, which amounted to 600,000,000 pounds, contained resin acids equivalent to about 250,000,000 pounds of rosin. The largest single use for rosin, paper size, consumes approximately 230,000,000 pounds per year. Conversion of rosin into ester gums, synthetic resins, chemicals, and pharmaceuticals accounts for about 320,000,000 pounds per