— 27 — 



Several repetitions of the method, partially neutralizing, as 

 directed by Schoenherr, gave results very much too low. The 

 solution of ammonia used in A, having sulphuric acid added, 

 after neutralization, gave on treatment in the azotometer, about 

 half the nitrogen originally present. Attempts to neutralize the 

 solution by barium carbonate gave similar results. 



The method, compared with a single determination by distilling 

 with soda, is much simpler. But as with a single azotometer only 

 one determination can be made at a time, and the labor of calcula- 

 tion is much greater, it is doubtful if the method is of great prac- 

 tical value. The chief argument in its favor is the fact that 

 the purity of the reagents is of less importance than in the usual 

 method. 



For the benefit of anyone who may care to repeat these experi- 

 ments, the following directions are given : 



To I gni of substance in a 250 cc. Kjeldahl flask add 20 cc. 

 of c. p. sulphuric acid and .7 gm. mercuric oxide. Digest until 

 colorless, and add potassium permanganate until the solution is 

 green. Cool, make up to 100 cc. and at once measure out 25 cc. 

 portions for treatment in the azotometer. Add the liquid to the 

 hypobromite cautiously. Measure the nitrogen evolved and cal- 

 culate to standard temperature and pressure. 



A modification of the Knop-Wagner azotometer, constructed in 

 this laboratory, was used. 



W. P. CUTTKR. 



FODDERS AND FEEDING STUFFS. 



The analyses recorded below were made partly in connection 

 with experiments on the farm or at the barn, and have been al- 

 ready in some cases partially reported in other Bulletins where 

 these experiments are described. The results of these analyses 

 are thus brought together in full, in tabular form, in order 

 that they may be more conveniently referred to as a contribution 

 to our knowledge of this subject. Many other analyses 

 were made, some of fodders called timothy, or clover, alone : 



