THE CHEMISTRY OF ESSENTIAL OILS AND ARTIFICIAL PERFUMES. By Ernest J. Parry, B.Sc. (Lond.), F.I.C., F.C.S. Second Edition, Revised and Enlarged. 552 pp. 20 Illustrations. Demy 8vo. Price 12s. 6d. net. (Post free, 13s. home; 13s. 6d. abroad.)