Contents. 
Page 
Introductory remarks . 5 
Report on essential oils, commercial and scientific , . 7 
Italian Pharmacopoeia 90 
Novelties . 94 
Notes on recent scientific work concerning terpenes and terpene derivatives 98 
Additional notes on aromatic chemicals 126 
List of abbreviations, 
d = specific gravity at 15°, unless otherwise stated. 
dgpO = specific gravity at 20°. 
20"^ 
d —Q = specific gravity at 20°, compared with water at 4°. 
4 
a^^^^ = optical rotation at 15°, in a 100 mm tube. 
Md ~ specific rotation. 
^Di5o ~ index of refraction at 15°. 
n = normal. 
semi -normal or deci- normal (titrated solutions). 
gm. = gram; cc. = cubic centimeter; mm. = millimeter. 
Temperatures are uniformly stated in centigrade degrees (°). 
