11 



described above for the samples of meat. The samples of meat from 

 each cut were kept separate, however, while only one sample of skin 

 was prepared for each animal. 



SAMPLES OF BONES AND OF MARROW. 



The bones from each cut were weighed and were united to make one 

 sample of bones from each animal. They were then chopped up into 

 bits about 1 inch long and the marrow removed. The marrow was 

 weighed in a tared dish and treated as samples of meat, except that 

 no determinations of moisture and fat were made in the original mate- 

 rial. The fragments of the bones after the removal of the marrow 

 were thoroughly mixed, and about half the total quantity was weighed 

 in a tared dish and dried to approximately constant weight in a large 

 agate-ware pan. After standing for from twenty-four to forty-eight 

 hours exposed to the air, the weight was again taken and recorded as 

 the weight of air-dried bones equivalent to the portion of fresh bones 

 taken for the drying. The sample thus obtained was passed through 

 a bone cutter, such as is used for poultry food, and from this, 500-gram 

 portions were weighed and treated with petroleum ether by decanta- 

 tion for the removal of the fat. The solutions of fat were very difficult 

 of filtration, hence were allowed to stand for some time for the almost 

 complete subsidence of the solid matter contained in them, when they 

 were carefully siphoned off and evaporated and the weight of the fat 

 contained in them determined. The residues were again dried and 

 exposed to the air for the establishment of the equilibrium of moisture 

 content, and again weighed, the weight obtained being recorded as the 

 weight of the air-dry, extracted bones. The samples thus obtained were 

 submitted to analysis, and the determinations made are recorded below, 

 all percentages being calculated back to the original material by use 

 of the data obtained in the preparation of the sample. 



SAMPLES OF SPINAL CORD. 



The spinal cord was carefully separated from the backbones and 

 neck bones, and the material thus obtained united to make one sample 

 of spinal cord for each animal. This sample was prepared for analysis 

 in the manner described for meats, but it was not practicable to make 



a direct determination of fat and moisture in the original sample. 







SAMPLES OF TENDONS. 



It was not practicable to separate the tendons from other cuts of the 

 animal than the feet and legs, that is, the portion sent to the labora- 

 tory under the name of "feet." The tendons were treated in the same 

 manner as the spinal cord. 



SAMPLES OF HOOFS. 



The hoofs were separated and weighed. In some cases some of the 

 hoofs had been removed in the process of slaughtering and dressing 



