730 



Journal of Agricultural Research voi.xii.No.it 



The recovery of ethyl butyrate was incomplete, owing to its high 

 solubility and volatility; that of ethyl palmitate was due to inability to 

 continue the distillation, owing to insufficient volume of higher esters and 

 excessive heat requirements. Ethyl oleate appeared in all fractions, 

 gradually increasing with the temperature. 



The percentage of the different fatty acids in the butter fat are 

 presented in Table VI. Butyric acid of the soluble acids and palmitic 

 acid of the insoluble were determined by difference, stearic acid by 

 crystallization, as previously stated, and oleic acid from the iodin number 

 of the insoluble acids. No allowance was made for unsaponifiable matter 

 in the calculation. 



The alkali-consuming and glycerol -combining powers of the several 

 acids are also recorded and confirm the results secured in large measure. 

 The glycerol requirements of the constituent acids slightly exceed that of 

 the fat, for the reason that no allowance was made for the free fatty acids 

 present. 



Table VI. — Percentage of fatty acids in butter fat 



Fatty acids. 



Amount 

 present. 



Sapoaifi- 



cation 

 niuuber. 



Glycerol. 



Soluble acids: 

 Butyric acid. , 

 Caproic acid. . 

 Caprylic acid . 

 Capric acid. . . 



Total 



Calculated . 



Insoluble acids: 

 Laurie acid . . 

 Myristic acid. 

 Palmitic acid. 

 Stearic acid. .. 

 Oleic acid . . . 



Per cent. 



"■o- 153 

 I. 360 



•975 

 I. 831 



Mgm. 

 20. 084 



6- 571 

 3- 795 

 5.966 



Per cent. 

 1.099 



■359 

 .208 

 .326 



7-319 



36. 416 

 37- 299 



1.992 



Total 



Determined , 



Soluble and insoluble acids: 



Total 



Determined or calculated from fat. 



6.89s 



22. 618 



°' 19. 229 



11.384 



27-374 



87. 500 



94. 819 



19- 319 

 55- 588 

 42. 089 

 22. 461 

 54- 395 



1-057 

 3.041 

 2.302 



1. 229 



2. 976 



193. 852 



194. 154 



10. 605 



230. 268 

 231-453 



12. 597 

 12. 542 



a By difference. 



