1909.] PUBLIC DOCUMENT — No. 31. 69 



according to information from the above firm, furnished 8 per 

 cent, of filtered oil, while the southern variety yielded 11 per 

 cent. The pressed cake from the several varieties was mixed and 

 ground before being fed; the oil from the several containers, 

 which was of a dark brown color, was mixed previous to feeding. 

 According to Lewkowitsch the bulk of the solid fatty acids in 

 the oil consists of palmitic acid and the liquid fatty acids of oleic 

 and linolic acids. ^ Our tests showed it to have a saponification 

 value of 191.95, a Hehner number of 95.31 and an iodine value 

 of 130.77. Its chemical character will be more fully discussed 

 in a separate article. 



Sampling the Feeds. 



The hay was sampled at the beginning of each period and 

 every two weeks thereafter. This was considered sufiicient to 

 furnish reasonably satisfactory information concerning its 

 chemical character. Forkfuls were taken from difi^erent parts 

 of the pile, run through a cutter, subsampled, and the reduced 

 sample placed in a large glass-stoppered bottle and taken to the 

 laboratory. A dry matter determination was made immediately 

 and a definite weight of each individual sample composited. 

 The normal grain ration and the soy bean meal were sampled 

 daily into glass-stoppered bottles and dry matter determinations 

 made at the end of the periods. In case of the normal ration, 

 one analysis was made from a mixture of the three different 

 samples. 



Sampling the Milk. 

 The milk of each cow was sampled twice daily for five con- 

 secutive days of each week of the trial, and preserved with 

 formalin in tightly corked bottles. The method of sampling 

 consisted in mixing the freshly drawn milk with a perforated 

 tin disk, 8 inches in diameter, fastened to the end of a rod. 

 This disk was drawn slowly up and down through the quantity 

 of milk a number of times, and then a small dipperful was 

 immediately removed. 



> Technology of Fats, Oils and Waxes, third edition. Vol. II., p. 506. 



