18 
BULLETIN 1241, U. S. DEPARTMENT OF AGRICULTURE. 
taining about 20 per cent of sulphite pulp, were imported in 1922. Of this papei 
Canada supplied 87 per cent. The total volume of sulphite imported in papei 
of other kinds is too small for comment. 
Sulphite imports as pulp were considerably larger than in paper, aggregating 
slightly over 710,000 tons in 1922. (Table 32.) Of this, Canada supplied 42 
per cent, Sweden 37, Norway 11, and other countries small amounts. Reduced 
to pulp wood, the pulp imports would therefore represent about 1,560,000 cords. 
Five hundred and fifty thousand cords of the pulp-wood imports from Canada 
were used for sulphite pulp. This figure, which is larger than for any othci 
pulp grade, measures the volume which we must secure from our own forests 
in order to be self-supporting in sulphite pulp wood. The sulphite-pulp relation- 
ships described arc further shown graphically in Figure 10 and Table 20. 
MECHANICAL PULP. 
Mechanical pulp made up slightly over 2,580,000 tons of American pulp 
requirements in 1922, or 44 per cent, and constituted the largest pulp grade. 
MILLION 
CORDS 
WOOD REQUIRED FOR MECHANICAL PULP, AND ITS SOURCE 
I I 
Total consumption 
a Total consumption 
-*From domestic sources 
a From Canada 
o From all other countries 
y» 
From domestic 
sources I 
From Canada 
From all other 
countrieST 
2~o 
:0— o-o^ 
1900 '05 '10 '15 '20 1925 
Fig. 11.— The amount of domestic pulp wood reduced by mechanical process has remained at practically 
the same level since 1904. The increased quantities necessary to meet American requirements have 
been imported chiefly from Canada in newsprint paper. 
Since, however the yield per cord by the mechanical process is relatively high in 
terms of pulp wood, the 1922 requirements for mechanical pulp were slightly 
less than 2,600,000 cords, or only 28 per cent of the total. 
Pulp-wood requirements for mechanical-pulp needs have become more than 
three times those of ,1899, and the pulp-wood equivalent of imports in all forms 
has been multiplied by ten. Domestic pulp wood now supplies only 45 per 
cent of our mechanical pulp-wood requirements, and its contribution has in- 
creased but little in the last 20 years. Canada now furnishes S9 per cent of 
the imports, with the equivalent of nearly 1,300,000 cords of pulp wood. (Table 
21.) 
Transportation difficulties confine the small importations in pulp form almost 
entirely to near-by Canada (Table 33), and from there an equivalent of about 
190,000 tons in 1922, or an equal number of cords, maintains a level which has 
held substantially since 1909 and 1910. 
Newsprint paper imports of nearly 1,030,000 tons in 1922, 80 per cent of which 
is mechanical pulp, represent a pulp-wood equivalent of more than 900,000 
