CHEMISTRY OF ODOURS 89 
interesting paper on the sense of smell at the British 
Association meeting at Bristol, September 1898. 
1899. Brmest I. Parry, B.Sc., ** The Chemistry of 
Essential Oils and Artificial Perfumes.” London: 
Scott, Greenwood & Co. 
The industry of essential oils is already of very great 
importance, and it is probable that we have valuable 
minor industries still in store based upon the production 
of medicinal and perfume oils. Mr Parry is the lead- 
- ing chemical authority on essential oils in England, and 
he has presented in this book precise and detailed 
information of great value to all interested in his subject. 
This volume is of peculiar interest and merit in that 
it gives full technical information upon a subject that 
has hitherto been almost a terra incognita to the average 
chemist. , 
The chemical composition, preparation, and analysis 
of the essential oils are first given, and this is followed 
by asystematic study of individual oils containing much 
information of general and commercial interest. The 
chemistry of artificial perfumes—the bugbear of all 
agricultural enterprise in essential oils—is dealt with in 
a closing chapter, while a table in the appendix gives 
a tabulated summary of the ‘‘constants” of all the chief 
products. 
