— 52 — 



of only 2,3 to 3,5%, so that the enormous proportion of the residue 

 in the oils under notice affords a clue to the degree of sophistic- 

 ation. The castor oil was identified directly by its constants and 

 its insolubility in petroleum ether, and in the samples adulterated 

 with turpentine oil the addition was revealed at once when the 

 optical behaviour of the first io°/ of the distillate was examined. 

 For, whereas in the case of normal oils the difference in the rotation 

 of the original sample as compared with the first io°/ of its dis- 

 tillate should be at most 5 , the values in this case differed by about 

 30 . The addition of lemon oil terpenes reduced the specific gravity 

 from 0,852 to 0,856, besides reducing the citral content. 



Orange Oil. The examination of 17 samples of oil of sweet 

 orange, some of which were adulterated, caused E. Dowzard 1 ) to 

 express himself on the subject of the limits of value applying to 

 the constants of sweet and bitter oils respectively. In this paper 

 Dowzard arrives at the same conclusions which have been formed 

 by ourselves. Having published our results at the time 2 ), a reference 

 to our former statements will now suffice. 



Eucalyptus Oil. Oil of the Globulus variety as well as the 

 ordinary Australian oil containing phellandrene was offered plentifully, 

 but we do not believe that satisfactory transactions have been con- 

 cluded, as the demand has only been of a very restricted character. 

 Large stocks appear to have accumulated at all the principal trading 

 centres, for which reason we regard a fall in the prices within the 

 near future as extremely probable. Oil from Eucalyptus maculata var. 

 citriodora has been more frequently asked for than it used to be. This 

 oil is particularly esteemed on account of its high citronellal content, 

 and the arrival of several important consignments has made it possible 

 to satisfy the demand. 



In the tenth part of the work edited by J. H. Maiden under the 

 title A critical revision of the genus Eucalyptus^, a book to which we 

 have already made repeated reference 4 ), the following eucalyptus varieties 

 are discussed: — 



Eucalyptus piperita Sm. [synonymum: Metrosideros aromatica Salisb.]. 



Eucalyptus Sieberiana F. v. M. 



*) Americ. Journ. of Pharm. 80 (1908), 474. 



2 ) Report October 1906, 35. 



3 ) Sydney 1908. 



4 ) Comp. Reports October 1903, 37; October 1904, 39; April 1905, 37; Oc- 

 tober 1905, 33; April 1906, 35; October 1907, 53; April 1908, 54- 



