1870.] 



contained in Crab-oil. 



305 



I. -259 grm. gave '7115 C0 2 and 295 H o 0 = *194 C and -0327 II. 

 II. -1731 grm. gave -4748 C0 2 and -195 I1 2 0 = -1295C and -02168 II. 

 Percentage composition : — 



I. II. Mean. 



Carbon 74-900 74-812 74-856 



Hydrogen 12-G24 12-51G 12-570 



Oxygen 12*476 12-072 12-574 



100-000 100-000 100-000 



These analyses, it will be seen, agree very closely with the formula for 

 palmitic acid, C M H 32 0 4 . 





Calculated 



At. weight. 



percentage composition. 





75-00 



32 



12-50 



. . 32 



12-50 



256 



100-00 



Preparation of the Soda-salt. — The acid was saponified with a dilute 

 solution of sodic carbonate, the jelly-like mass was pressed and dried, and 

 the fat salt dissolved out with absolute alcohol ; the alcoholic solution, when 

 cold, gelatinized ; the gelatinous mass was pressed, dried, and dissolved in 

 alcohol, and filtered : this salt was not analyzed. 



Preparation of the Silver-salt. — The soda-salt was dissolved in hot water 

 and precipitated by argentic nitrate ; the precipitate was washed in the 

 dark ; the analysis of this salt yielded the following results : — 

 I. -2255 grm. gave *067 grm. Ag. 



II. -5088 grm. gave -152 grm. Ag. 



III. -6044 grm. gave 1-1572 grm. C0 2 and -4555 grm. H o 0 = 

 •3156 grm. C and -05061 H. 



IV. -3267 grm. gave -634 grm. C0. 2 and -257 grm. H 2 0 = -1729 C 

 and -02855 H. 



Percentage composition : — 



T. II. Mean. 



Carbon t 52-217 52'923 52-5/0 



Hydrogen 8'373 8739 8*556 



Oxygen 9-698 8'464 9'081 



Silver 29 7 12 29 8 74 29 7 93 



100-000 100-000 100-000 

 The following are the calculated numbers for argentic palmitate : — 



VOL. XVI II. 2 A 



