- 84 - 
(ester number 216,23), which, however, is still higher than that of 
2:)etitgrain mandarinier. We are not yet in a position to supply further 
details on the character of this ester. 
In accordance with the foregoing, oil of mandarin leaves appears 
to have a composition which is entirely different from that of oil of 
bergamot leaves, concerning which we give some information elsewhere. 
Notes of recent scientific work concerning terpenes and 
terpene derivatives. 
In the province of literature w^e have to record the publication, 
w^hich has just taken place, of an enlarged edition of Heusler's work 
on terpenes, which at the time was so favourably received in inter- 
ested circles. This new edition has been prepared by Professor Pond 
of Philadelphia, who has become know^n as Wallach's collaborator; 
it is a translation of the original German w^ork into English, which in 
suitable places has been enlarged, occasionally to a ver}^ considerable 
extent, by additions which have become necessary since Heusler's 
work first appeared. The EngHsh (and American) literature has 
received a valuable addition by the publication of this enlarged edition, 
for, apart from a few short abstracts which had been given in works 
on essential oils, a treatise in the English language, dealing with the 
whole question of terpenes, had always been wanting. But as the 
book gives information on the results obtained during the last few 
years, it will also be useful to German chemists who have full com- 
mand over the English language. 
We believe that we may abstain from a detailed discussion of 
the work, as this wiW no doubt appear from a qualified hand in an- 
other place. 
A long lecture on ''The Industry of Perfumes" has been held before 
the Societe chimique de Paris by J. Dupont^). After a short criti- 
cism of Klimont's experiments to adopt "aromatophorous" groups in 
aromatic bodies, based upon Witt's example in the case of pigments, 
the lecturer turned to the nitrogenous bearers of perfumes which have 
in recent times claimed a constantly growing amount of attention, 
especially the indol derivatives and ptomaines produced by animals 
and plants during the vital process, or after death. Of the three 
sharply defined branches of the technical science of aromatics, viz., 
the manufacture of natural floral odours, the synthetic production of 
^) Bull. Soc. chim. III. 27 (1902), supplement to No. 15. 
