— 110 — 



to 



an adulterant previously observed by Parry 1 ), which possessed a high 

 rotatory power may also have been gurjun balsam oil, or a mixture of 

 that oil with some other substance, for Parry states that this addition 

 had also raised the alcohol-content of the oils. It will therefore be ad- 

 visable to keep this adulteration in view for the future. In the isolation 

 of the rose-oil stearoptene, gurjun balsam oil is precipitated together with 

 the stearoptene, and it may therefore be desirable to extend the exami- 

 nation of rose oils in this direction and to submit the stearoptenes to 

 closer examination, at any rate in all cases in which the rotation of the 

 oil in question exceeds — 2° 30'. 



We may quote particulars of two other samples of rose oils which 

 have been examined in our laboratory in the course of the past few months. 

 The first represented a rose oil which had been offered to us for pur- 



No. l 



Original 

 oil 



Extracted 

 with water 



No. 2 



Original 

 oil 



Extracted 

 with water 



U300 



"d . - • 



n D250 



Sol. p 



Acid v 



Ester v 



Ester v. after acet 



Total geraniol 



Quantity of added alcohol 2 ) 



0,8755 



-20° 36' 



1,48042 



+ 10,7° 



1,0 



7,6 



119,9 



36,2°/o 



6,5°/o 



0,8793 

 -21° 50' 



0,8639 



-1°21' 



1,45901 



+ 18,0° 



1,8 



19,1 



249,7 



84,5°/o 



6°/o 



0,8667 



-1°23' 



1,46664 



+ 17,0° 



1,7 



20,0 



240,3 



80,6°/o 



chase, and which every analyst, even upon cursory examination, would 

 have rejected as highly adulterated on account of the great abnormity 

 of its constants. Apart from the alcohol which we discovered to be 

 present in it (see the table below), it is possible that this oil was also 

 adulterated with gurjun balsam oil, but the sample at our disposal was 

 unfortunately too small to permit of its examination for this adulterant. 

 The second sample submitted to us for our opinion had already been 

 examined in another quarter and, singularly enough, had been pronounced 

 to be unobjectionable, notwithstanding that a carefully executed control-test 

 made by us easily showed it to be also adulterated. (For the method ot 

 testing compare Reports November 1908, 107, and April 1910, 93.) This sample 

 contained in the first place about 6°/o spirit, calculated for 90% alcohol. 

 In the next place, the specific gravity and coefficient of refraction of the 



*) Chemist and Druggist 77 (1910), 261; Report October 1910, 111. 

 2 ) The alcohol was isolated as such. 



