424 COMPOUND PRODUCTS. CHAP. I-. 



swims on the top of the water in the vessel beneath. 

 It is manufactured chiefly in France and in Italy, 

 and is much used throughout Europe to give a sea- 

 soning to food. Stdly, Oil of Almonds, which is 

 extracted from the fruit of the Amygdalus commit- 

 nis or common Almond,, a tree that grows also 

 naturally in the South of Europe. The Almonds 

 are first well rubbed or shook in a coarse bag or 

 sack to separate a bitter powder which covers their 

 epidermis. They are then pounded to a paste in 

 mortars of marble, which is afterwards subjected to 

 the action of a press ; and the oil is now obtained 

 as in the case of the Olive. 3dly, Rapeseed Oil, 

 which is extracted from the Brassica Napus and 

 campestris. It is less fixed and less liable to be- 

 come rancid than the two former, and is manufac- 

 tured chiefly in Flanders. 4thly, Oil of Behen, 

 which is extracted from the fruit of the Guilandina 

 Mohringa, common in Egypt and Africa. Jt is apt 

 to become rancid ; but it is without odour, and is 

 on this account much used in perfumery. 

 Drying The principal species of drying oils are Linseed 

 oil, Nut oil, Poppy oil, and Hempseed oil. 1st, 

 Linseed oil is obtained from the seeds of Flax, 

 which are generally roasted before they are subjected 

 to any other process, for the purpose of drying up 

 their mucilage and separating more oil. The oil is 

 much used in the composition of paints ; and with 

 the oxide of lead it is employed by chemists as a lute. 

 , Nut oil is extracted from the fruit of Corylus 



