440 ODOEOGPvAPHIA. 



Zinalyl-fonniate (liquid). Boiling point 100°-103^ at 10 m. m. 

 Aroma resembling Petit-grain oil and Bergamot oil. 



Linalyl-acetate (liquid). Boiling point 108^-110^ at 10 m. m. 

 This ester possesses a strong Bergamot odour and will doubtless 

 be very useful. We have prepared a large quantity of this article, 

 which we bring into commerce under the name of Bergamiol." 



Vol. I., p. 77. 



Bergapten. The chemical constitution of this crystalline 

 constituent of Bergamot oil is represented by the formula 

 C\o Hg 0„. It has recently been investigated scientifically by 

 Pommeranz.* 



Vol. I, p. 70. 



Lemon oil. As turpentine oil is the main adulterant of 

 Lemon oil, of which it lowers the specific rotatory power 

 considerably, while on the other hand it increases the specific 

 gravity, the determination of these two points becomes of great 

 importance. The rotatory power of a good pure Lemon oil should 

 not be below + 60^inal00 m.m. column, and the sp. gr. should be 

 from 0-858 to 0-859 at 15° C. If these tests are applied with due 

 care, adulteration by turpentine oil cannot pass undetected.. 



Other probable adulterants of Lemon oil are the terpenes (a 

 mixture of Pinene and Limonene), which are abstracted from 

 Lemon oil in the manufacture of the so-called " Terpene-free 

 Lemon oil," or concentrated Lemon oil. These terpenes, although 

 of a lemon-like odour, contain practically no Citral, the odoriferous 

 principle of oil of lemon. It is stated that a firm of manufacturers 

 of the "Terpeneless Lemon oil" is doing a considerable trade in such 

 terpenes, invoicing the same under the denomination of " Citrene." 

 As " citrene " is not to be found in price-lists the inference is that 

 it is used to cheapen Lemon oil. What is now required to check 

 this manipulation is a process for the quantitative determination 

 of the citral percentage in Lemon oil. Efforts are being made to 



* Monatsheft fiir Chemie, 1893, p. 28. 



