to the endeavour, and we did not do this unselfishly; on the contrary, we selected a wish-list of specialists who would provide us with new insight and characterize the trends and research priorities determining the future. Thus, we were counting on learning much ourselves in the course of the project. We were more than pleasantly surprised by the reactions to our first letter-and so was Elsevier. We certainly had not expected perfumers who are usually much more 'doers' than 'writers' to react in such an enthusiastic way; especially, the spontaneous affirmative answer from the famous E. Roudnitska created a momentum which contributed significantly to the successful comple­ tion of this book. But, of course, we should not create the impression that the other authors' chapters are less important, and we thank all of them heartily for their invaluable effort.