140 OILY OXIDES, SAPONIFIABLE. 



"When cooled it deposites stearin, which may be separated by 

 the filter. When boiled in alcohol it becomes deeper coloured, 

 and the elain is separated. One hundred parts of absolute alco- 

 hol dissolve at a boiling temperature 55^ of stearin. When the 

 solution is cooled it deposites first white brilliant crystals, and then 

 yellowish coloured crystals, and there remains a thick brown li- 

 quor, which has not been examined. When this stearin is sapo- 

 nified we obtain glycerin, some phocenic acid, and 38*9 per cent, 

 of fatty acids. 



The elain is not decomposed by alcohol. One hundred parts 

 of boiling absolute alcohol dissolve 122 parts of it. When treat- 

 ed with half its weight of hydrate of potash it is easily saponified ; 

 glycerin being evolved together with a little phocenic acid and 

 margaric and oleic acids. The oleic acid has a fishy smell, which 

 it communicates to its salts. 



10. OIL OF THE DELPHINUS PHOCENA OR PORPOISE. 



This oil is liquid, and has a yellow colour. It has at first a 

 fishy smell, which goes away when the oil is exposed to the sun 

 and air. Its specific gravity is 0-937. When exposed to the 

 air it acquires at first a brown colour, which gradually disappears. 

 It then acquires the smell of oil of colza, and reddens vegetable 

 blues. 100 parts of boiling alcohol of 0-821 dissolve 20 parts 

 of the oil ; but the solution becomes muddy on cooling. But 

 when we boil together equal parts of the oil and alcohol, no pre- 

 cipitate appears, and we may add more oil almost in any propor- 

 tion. 



When saponified this oil yields, 



Margaric and oleic acids, . 82-2 

 Glycerin, . . 16 



Together with a certain quantity of phocenic acid. 



11. OIL OF DELPHINUS GLOBICEPS. 



This oil is fluid, and has a light lemon-yellow colour, and a 

 fishy smell. Its specific gravity is 0-918. 100 parts of absolute 

 alcohol at 68 dissolve 123 parts of it. When cooled slowly to 

 the point of congelation, or a little below it, this oil deposites a 

 cetin, similar to that from the Pliyseter macrocephalus, but not 

 quite identical with it. 



When melted, this cetin begins to congeal at 114, and it is 



