1899.] 



PUBLIC DOCUMENT — No. 33. 



127 



Analysis of Dry Matter. 



Box 1. 



Box 2. 



Box 3. 



Box 4. 



Fat 2.05 



Protein 11.50 



Cellulose 1.55 



Ashes I 1.95 



Carbohydrates 82.95 



100.00 



2.00 

 14.44 

 1.65 

 1.52 

 80.39 



100.00 



2.12 

 11.94 

 1.65 

 2.20 

 82.09 

 100.00 



1.97 



13.69 



1.62 



1.44 



81.28 



100.00 



Judging from the results obtained in connection with 

 the described experiment the following conclusions suggest 

 themselves : — 



Conclusions. — The alkaline phosphate (phosphatic slag 

 meal) has under fairly corresponding conditions increased 

 the availability of the nitrogen contained in steamed leather, 

 in leather scraps and in dried blood in a higher degree than 

 the aeid phosphate. The influence is apparent alike in the 

 general character of the entire plant and in the composition 

 of the kernels. The difference in the relative agricultural 

 value of both articles as nitrogen sources remains, however, 

 the same ; for leather in any form, without a previous de- 

 struction of the tanning principle, tannin, is worthless for 

 mammal purposes. 



5. CONTRIBUTION TO THE DETERMINATION OF THE AVAIL- 

 ABLE Phosphoric Acid in Soils under Cultivation. 

 The fact that agricultural chemists have thus far failed to 

 point out any mode of soil analysis as reliable, by which 

 the amount of phosphoric acid available to crops can be 

 ascertained, is pretty generally recognized. Attempts are 

 not wanting to solve this important question. Among the 

 well-known investigations in that direction are those of Dr. 

 B. Deyer (1894). Results of later years obtained in this 

 connection upon soils of well-known history at Rothamsted 

 in England are pronounced very encouraging by Dr. (Gil- 

 bert. The American Association of Official Chemists has 

 during the past year entered upon a systematic investigation 



