64 



In the first table it will be noticed that if the data concerning the albumoses and 

 peptones are omitted, the round and rump cuts in every case give higher figures than 

 the other two cuts. When the hand-separated fat is eliminated we find less variation; 

 the round and rump cut gives higher results than the rib but is equaled or slightly 

 surpassed in a few cases by the loin. When the fat is entirely eliminated, as shown 

 in the third table, the difference is still less. However, in only one case does the rib 

 cut (steer 18, coagulable nitrogen) give as high results as the round and rump cut; 

 and in anotKer case (steer 503, amido-acid nitrogen.) as high as the loin. In six cases 

 the loin cut gives higher results than the round and rump cut. In general, steer 

 No. 505 gives the highest results, especially in the case of the amido-acid nitrogen, 

 there being only one exception, namely, the coagulable nitrogen in the rib cut on the 

 fat-free basis. A further discussion of these results will not be attempted at this 

 time. 



For the purpose of making an extended study of the composition of beef extract 

 there was prepared at the Missouri station (at the time of slaughtering) a cold-water 

 extract * from a 5-kilo sample of the round of each animal. The filtered extract was 

 coagulated upon the water bath, filtered, and concentrated with one or two filtrations 

 as the concentration proceeded. The extracts -have been finally concentrated to a 

 semisolid mass, in which condition they appear to remain in a state of perfect preser- 

 vation. The life history of the animals from which these extracts have been pre- 

 pared is known and during the next year cooperation in the examination of these 

 extracts will be requested, to determine the composition of pure beef extract and to 

 learn to what extent variation may be expected. 



The president announced the following membership for Committee 

 B on recommendation of referees: Messrs. B. B. Koss, R. W. Thatcher, 

 A. S. Mitchell, Paul Collins, and W. D. Bigelow. 



The following committee was appointed to wait upon the Secretary 

 of Agriculture and the Assistant Secretary and invite them to address 

 the convention : Messrs. M. E. Jaffa, J. M. Bartlett, and W. A. Withers. 



On motion by Doctor Wiley, the vote on the amendments to the 

 constitution was made special order for 12 o'clock, or following the 

 presidential address, on Friday. 



REPORT ON PRESERVATIVES. 

 By W. D. BIGELOW, Referee, 



SALICYLIC ACID. 

 RAPID DETERMINATION OP SALICYLIC ACID. 



The methods of the association for the quantitative determination of salicylic acid 

 are long and tedious because of repeated extraction with immiscible solvents. An 

 attempt was made to simplify these methods by extracting a certain volume of the 

 food, or an aqueous extract thereof, by means of a definite volume of solvent, evapo- 

 rating to dryness an aliquot portion of the solvent used, and determining the salicylic 

 acid in the residue. The total amount can then be calculated by a factor to be deter- 

 mined by experimental work. 



It is, of course, necessary that the solvent, under certain conditions to be adopted, 

 should extract a uniform amount of salicylic acid uncontaminated by substances that 



Trowbridge and Grindley, J. Amer. Chem. Soc., 1906, 28: 472. 



