It is now fifteen years since the last edition of this reference volume
appeared and during this time new materials have appeared and some have
fallen into disuse. The present edition is the result of much revision
and some deletion and an effort has been made to bring the information
up-to-date and in conformity with current practice. Of recent years
several speciality materials have appeared, and a number of these are
included where their chemical composition is known. Speciality materials
of vague composition are not included. For many of the compounds listed
several alternative names are in use, some of which from the chemist's
point of view are either inadequate, ambiguous, or occasionally actually
misleading. In this edition the compounds have been listed under names
which are considered to be chemically satisfactory and which, at the
same time, should be reasonably familiar to perfumers; they do not
necessarily contain full information as to the structure of the com-
pound and they make free use of widely accepted trivial names. In most
of the entries this is followed by a systematic name which defines the
chemical structure, while synonyms which are in use, though sometimes
chemically unsatisfactory, are given in brackets, with a cross-reference
to the main entry. Prefixes denoting structural features, such as n-,
iso-, cis-, trans-, 0-, m-, p-, and so on are disregarded in the
alphabetical listing.
