Du Mez—The Galenical Oleoresins. 
935 
solvents, such as ether, make use of some form of continuous ex¬ 
traction apparatus. 
Such an apparatus was invented by Mohr in 1847 and its 
advantages in the preparation of the oleoresins pointed out by 
him at this time, and later, by Procter. An apparatus operat¬ 
ing on similar principles was described by Parrish in 1884 in his 
Treatise on Pharmacy. More recently Maish (1900) has sug¬ 
gested the use of the Soxhlet apparatus for the preparation of 
small quantities of oleoresins, while a number of other forms of 
continuous extraction apparatus have been mentioned in this 
connection in the various periodicals and text-books on phar¬ 
macy. 
The different forms of apparatus, which have been mentioned 
at various times in connection with the preparations of the oleo¬ 
resins, and the methods of operating with the same are described 
in detail in the following chronological list: 
Cadet, C. L. 
Filtre-presse de M. Real. 
Jour, de Pharm., 2, pp. 165 and 192; Repert. der Pharm. 2, 
p. 356. 
Fig. 1.) The body of the extraction apparatus A is made of 
tin, the top of which, being screwed on, can be removed. It is 
