MM. Redtenbacher, Varrentrapp, Mayer and Bromeis. 119 



Its formula is therefore G44 H39 04 + Ba O, and that of the 

 acid analysed is C44 Hgq 04+Aq. 



The oleic aether was C44 Hgg O4 + C4 H5 O. 



When oleic acid is distilled, there is produced a small 

 quantity of carbonic acid, sebacic acid, a large proportion of 

 a liquid having the composition of olefiant gas, and some 

 charcoal remains : thus 



1 atom of Sebacic acid Cjq Hp O ^ 



3 atoms of Carbonic acid C 3 O e L ^^^ formed 



4 Carbon C4 [ from 



Carburet of Hydrogen ... C71 H7, J 



2 atoms Oleic acid = Cgg HgQ Ojq. 



As no other fatty acid produces sebacic acid when distilled, 

 its fq^'malion is a test of the presence of oleic acid. Hence 

 we may know if wax or spermaceti, or stearic acid, have 

 been adulterated with tallow by submitting a small quantity 

 to distillation. 



When the oleic acid is warmed with an excess of caustic 

 potash and a few drops of water, until it be completely sapo- 

 nified, and then more potash being added, the temperature 

 be raised to the melting point of the latter, the mass, which 

 should be constantly stirred, does not become brown, but 

 disengages a quantity of hydrogen gas. When the mass so 

 produced is dissolved in water and decomposed by an acid, 

 a white solid separates in large crystalline grains like stearine. 

 Elaidic acid treated in the same way yields an identical pro- 

 duct. 



When crystallized from its alcoholic solution this new 

 acid fuses at I'lS^ Fahrenheit; when analysed it gave the 

 following result : 



32 atoms of Carbon... 24-4<S*9 75-69 



31 Hydrogen 386-0 11*97 



4 — ^ Oxygen... 'tOO'O 12*34. 



3231-9 100*00 

 The silver salt gave as follows: 



32 atoms of Carbon 24.4'5-9 53*54 



30 Hydrogen... 374*4 8'20 



3 Oxygen 300*0 6*50 



1 Oxide of silver 1451-6 31*76 



4571-9 100*00 



The formulae are, therefore, for 



the silver salt .... Cj,, Hyg O3 + Ag O 

 the crystallized acid C32 H^ O3 + Aq. 



