12 



BULLETIN 37, U. S. DEPARTMENT OF AGRICULTURE. 



Two sets of figures are given for tankage and blood. They are 

 based on the respective estimates of the slaughter hi the United States 

 by the Bureau of Animal Industry and Mr. F. S. Lodge. The Bureau 

 of Animal Industry derived their estimate of the slaughter partly 

 from the number of animals killed under Government inspection, 

 which they regard as 60 per cent of the total wholesale slaughter. 

 Their estimate is given in detail in Table XII. 



An error may have been introduced in the figures for nitrogen 

 yielded by tankage and blood by taking the wrong value to represent 

 the percentage composition of these in nitrogen. Their composition 

 is quite variable; a figure was taken which, it was believed, justly 

 represented their average content in nitrogen. 



Table XIV. — Sources of nitrogen used i.i mixed fertilizers of the United States. 



Material. 



Amount 

 used in 

 United 

 States. 



Nitrogen 

 content. 



Nitrogen 

 yielded. 



Ammonium sulphate 



Sodium nitrate (Chilean) 



Calcium nitrate (artificial) 



Calcium cyanamid 



Cottonseed meal 



rr. , (Bureau of Animal Industry 



Tanka S e JLodge . 



Fish scrap 



Dried blood{£^ a e u ot ^ ima | ^ d ^ " 



11,264 



161,950 

 99 324 

 70'000 

 57,473 

 37,710 



Per cent. 

 19.75 

 15.5 

 12.75 

 18.0 

 6.5 



6.5 



9.0 



11.0 



Tons. 

 42,463 

 10,850 



2,028 



10,527 

 6,456 

 6,300 

 6,322 

 4,148 



ADDITIONAL COPIES of this publication 

 -tx may be procured from the Superintend- 

 ent of Documents, Government Printing 

 Office, Washington, D. C. , at 5 cents per copy 



WASHINGTON : GOVERNMENT PRINTING OFFICE \ 1913 



