“…(+)-Limonene was distilled from Valencia orange essence oil, bp 45-50°(1.5 mmHg), [a]29D 116.5°(c 1.24), and shown to be more than 99% pure by GC (Shaw and Coleman, 1971). U.S. Citrus and Subtropical Products Laboratory, Southern Region, U.S. Department of Agriculture, Agricultural Research Service, Winter Haven, Florida 33880.…”