6 
1879-1883, with 100 lithograpliic plates, in which 
work also the hygienic action of the Eucalypts 
on climate is discussed. 
Professor Schulz freed the oil from irritating 
acid and other extraneous products of distillation 
by shaking it repeatedly with a diluted solution 
of soda, tlie separation from which is accelerated 
by warming ; he moreover exposed the oil for 
months to the influence of light and atmospheric 
air, with the effect of its being laden with oxygen, 
by which means the odour of the oil becomes also 
much more pleasant. 
The second chapter of Dr. Schulz’s treatise is 
devoted to explanations concerning the chemical 
constitution of the oil of Eucalyptus Globulus. 
As well known, Professor Cloez, of the Paris 
University, was the first who occupied himself 
with the investigation of the chemical constituents 
of the Eucalyptus oils [from material sent by the 
writer ; he thus obtained by fractional distillation 
Eucalyptol, which as an uniform product would 
perhaps be the best for medicinal use.] Faust 
and Homeyer, who seem to have operated with 
the oil of Eucalyptus amygdalina, declared that 
Cymol was one of the constituents of the oils of 
Eucalypts, an assertion contradicted by Oppen- 
heim and Pfaff, and now also by Schulz, no 
cuminic acid being eliminated by the urine ; thus 
the noxious effect of Cymol on the human system 
need not be dreaded when Eucalyptus oil is used. 
