306 



On the Acids contained in Crab-oil. 



[Mar. 31' 



At. weight. Percentage composition. 



C 1G 192 52-89 



H 31 31 8-54 



0 2 32 8-82 



Ag 108 29*75 



363 100-00 



Preparation of the Ether. — Dry hydrochloric acid gas was passed to 

 saturation through a warm solution of the acid in absolute alcohol ; the 

 solution was then diluted with water, which caused the ether to separate as 

 a yellowish oil, which, as it became cold, assumed the appearance of a 

 waxy body ; it was boiled with water, and afterwards agitated with a hot 

 dilute solution of sodic carbonate ; it was again dissolved in alcohol, and 

 precipitated from this solution by water ; it was then collected and dried ; 

 its analysis yielded the following results : — 



I. -2197 grm. gave -6112grm. of C0 2 and '25 grm. H 2 0 = *1G67 C and 

 •0278 H. 



II. -204 grm. gave '567 grm. of C0 2 and -233 grm. of H a 0=-15464 C 

 and -02589 H. 



Percentage composition : — 



I. II. Mean. 



Carbon 75'876 75-803 75-839 



Hydrogen 12*643 12-691 12-667 



Oxygen 11-481 11*506 11 '494 



100-000 100-000 100-000 



The following are the calculated numbers for ethylic palmitate, 



C 10 H 31 (C 2 H,)0 2 :- 



At. weight. Percentage composition. 



C 18 216 76-05 



H 36 36 12-68 



0 2 32 11-27 



284 100-00 



Preparation of the Baric Salt. — A hot alcoholic solution of the acid 

 was saturated with ammonia in slight excess, and boiled with a solution of 

 baric acetate ; the precipitate falls as a white flocculent mass, which, when 

 thoroughly washed, dried, and powdered, has the appearance of a glistening 

 spongy powder. 



I. -276 grm. gave -0625 grm. of Ba 0 = 23*64 per cent. 

 II. '752 „ -17906 „ =23-81 „ 

 Theory requires 23*65 



I did not consider it necessary to make a carbon and hydrogen dctermi- 



