Chemistry of Essential Oils

PKEFACE TO THE FOURTH EDITION.

THE rapid sale of the Third Edition of this work has necessi-

tated the publication of this, the Fourth Edition. No alteration

has been made in the arrangement of the subject-matter, which

has been brought up to date, so that all work of importance

published up to the end of 1920 has been included.

EKNEST J. PAKEY.

56A GREAT DOVER STREET,

LONDON, S.E., March, 1921.