500 Report of the Department of Animal Husbandry of the 



The justification of this change is found in the following 

 figures, the only reasonable explanation of which is that the 

 petroleum ether takes out less material that is not fat or oil than 

 does the sulphuric ether. Certainly the petroleum ether would 

 not fail to remove all the fats or oils, and therefore gives figures 

 nearer the truth than does the usual solvent. 



Comparison of Results of Extraction of Fats with Sulphuric and 



Petroleum Ethers. 



o " 



61 

 62 

 316 

 317 

 309 

 310 

 311 

 312 

 313 

 314 

 315 

 96 

 99 

 102 

 108 

 124 

 127 

 130 

 133 

 136 

 139 



SAMPLE. 



Timothy bay 



Oiits 



Timothy hay (ixtiacted) 



Com (extracled) .'. 



Feces 

 Feces 

 Fece.s 

 Feces 

 Feces 

 Feces 

 Feces 

 Feces 

 Feces 

 Feces 

 Feces 

 Feces 

 Feces 

 Feces 

 Feces 

 Feces 

 Feces 



normal ration) ... 

 iioimal ration)... 

 normal ration) ... 

 normal ration) . . . 

 normal ration) ... 

 nosmal latiouj ... 

 normal ration) ... 

 extracted ration), 

 extracted ration) . 

 extracted ration), 

 extracted ration) 

 extracted ration), 

 extracted ration) . 

 extracted ration), 

 extracted ration), 

 extracted ration), 

 extracted ration) . 



Sulphuric 



ether 

 extract. 



Per cent. 

 3.29 

 4.71 

 1.77 

 .51 

 3.58 

 3.58 

 3.87 

 3.78 

 3.87 

 3.8i 

 4.07 

 1.17 

 1.18 

 1.18 

 1.16 

 1.46 

 1.32 

 1.36 

 1.45 

 1.46 

 1.41 



Petroleum 



ether 



extract 



40-60°. 



Per cent. 

 1.77 

 4.52 

 .85 

 .59 

 2.58 

 2.75 

 2.85 

 2.98 

 2.67 

 3 



2.78 

 .91 

 .85 

 .86 

 .88 

 .9:^ 

 .97 

 1.06 

 .96 

 .85 

 .98 



Charcoal 

 (sulph. 

 ether) 



extract. 



Per cent. 



1.85 



3.75 



.63 



.47 



2.97 



.84 



.88 



Nitrogen was determined directl}" in fresh samples of the urine 

 and feces. The drying of the feces at a temperature varying 

 from 50° to 60° C. caused a material loss of nitrogen as the re- 

 sults clearly show. 



The comparisons given are the first thirty-six or fifty-nine oases 

 in which the nitrogen was determined in both the fresh and the 

 air dry samples. There was but one instance in the fifty-nine 

 comparisons where more nitrogen was not obtained from the; 

 fresh sample. 



