274 POPULAR ECONOMIC BOTANY. 



to its presence, that perfume, when properly prepared, 

 being a distillation of orange-flowers with alcohol. Spurious 

 Eau de Cologne is made by dissolving the Oil of JNeroli in 

 weak spirit-of-wine. 



There is a deliciously scented oil called Cetronelle, 

 imported from Ceylon in small quantities; it is generally 

 said to be from Citron -flowers. The author is very doubt- 

 ful of this origin, and believes rather that it is the produce 

 of one of the species of Androjpogon, to which genus the 

 Lemon-grass of India also belongs. It usually arrives in 

 cases with the lemon-grass oil, a case often consisting of 

 twelve small bottles, or six of each of these essential oils ; 

 besides which it apparently belongs to the oxygenated 

 essential oils, whereas all the other volatile oils procured 

 from the Aurantiacea are non-oxygenated. The Oil of Ce- 

 tronelle is largely used for scenting the soap called Honey 

 Soap, now much used. 



Oil of Juniper, distilled from the berries and young 

 shoots of the Common Juniper (Juniperus communis: Coni- 

 fer a). (Plate XIX. fig. 101.) It is used in giving a spu- 

 rious flavour to gin, and also in pharmacy. From Germany. 



The Second Class of Essential Oils contain oxygen in 

 addition to carbon and hydrogen (C H 0) ; they are con- 



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