12 
BULLETIN 37, U. S. DEPAETMENT OF AGEICULTUKE. 
Two sets of figures are given for tankage and blood. They are 
based on the respective estimates of the slaughter in 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 animalc 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 1 .verage content in nitrogen. 
Table XIV. — Sources of nitrogen used in 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 
Tankage{£^|f_ of , A . n ^^ d ^; : ;;; 
Fish scrap . 
Dried blood{g^g u _ of ^ ma ;_ Ind _ ustr 5;; 
Tons. 
215,000 
70,000 
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 o f this publication 
-t\. 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 
