CAEAAVAY. 



133 



The yield of volatile oil from the different growths of seed is as 

 follows : — 



The sp. gr. of these oils varies from 0*905 to 0'915 at 15^ C, 

 and the optical rotation from + 75*^ to + 85^ in 100 m. m. tube. 



Part of the acreacre under cultivation for 1893 is estimated as 

 follows : — 



In the Province of Xorth Holland ... 1250 acres 



„ Groningen 250 „ 



„ Zealand 375 „ 



or about the same as 1892. In Germany, the cultivation is 

 decreasing in consequence of the excessively depressed price of the 

 seed not giving sufficient profit to the cultivator. 



An inferior oil is distilled from the husks and refuse collected 

 after threshing the fruit. It is known as " Carraway chaff oil " and 

 is only suitable for perfuming common soaps. 



Oil of Caraway is frequently adulterated with oil of turpentine, 

 in which case it forms a turbid mixture with alcohol of 90 per 

 cent. 



Oil of caraway is composed of a mixture of Carvol C^q Hj ^ 

 and Carvene C^q H^g, the carvol generally amounts to two-thirds, 

 but as the proportion is variable, the boiling point and sp. gr. of 

 the crude oil also vary. The two bodies can be separated by frac- 

 tional distillation, but a quicker and easier way is to agitate the 



