28 BULLETIN 983, TJ. S. DEPARTMENT OF AGRICULTURE. 
Series la. 
400 per cent of H2O; 1.80 to 1.85 per cent of H2SO4; cooking time. 15 minutes. 
Cook No. 
Pressure 
(atmos- 
pheres). 
Yield of 
total sugars 
(per cent of 
dry wood). 
S ' 4. 25 
7.! 6.3 
2i 1 7. 1 to 7. 3 
18 j 7.5 
5 7.75 
11 8.1 
12 9. 3 
11.29 
20.48 
21.50 
22.85 
21. 54 
20. 05 
11.58 
1 The steam pressure varied between these points and it was not possible to keep the digester pressure 
uniform. 
TO 
UJ J 
>o- 
> 
/ 
y 
/" 
/ 
S\ 
s 
y 
y 
s 
y 
2 4 6 8 10 12 14 16 18 20 22 24 
YIELD IN % OF TOTAL SUGAR ON DRY WEIGHT OF WOOD 
Fig. 1.— Series la, showing the variation of yield of total sugars with varying pressures of cooking. Cook- 
ing period, 15 minutes. 
Series 16. 
400 per cent of H 2 0; 1.80 to 1.85 per cent of H 2 S0 4 ; cooking time, minutes 
Cook No. 
Pressure 
(atmos- 
pheres). 
Yield of 
total sugars 
(per cent of 
dry wood). 
20 
6.5 
IS. 34 
15 
22.59 
16 
7. 5 
9.0 
22.70 
19 
21.29 
