BULLETIN 983, U. S. DEPARTMENT OF AGRICULTURE, 



Series la. 

 400 per cent of H 2 0; 1.80 to 1.85 per cent of H 2 S0 4 ; cooking time, 15 m in uted 



Cook No. 



Yield of 

 total sugars 

 (percent of 

 dry wood). 



11.29 

 20. 48 

 21.50 

 22.85 

 21.54 

 20. 05 

 11.58 



i The steam pressure varied between these points and it was not possible to keep the digester pressure 

 uniform. 



10 



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x 

 a. 



o b 

 as 



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UJ 



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y 



















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X 





















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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 lb. 

 400 per cent of H2O; 1.80 to 1.85 per cent of H2SO.1; cooking time, minutes. 



Cook No. 



Pressure 

 (atmos- 



1 iluTl'S ). 



Yield of 

 total sugars 

 (per cent of 

 dry wood). 



20 



6.5 

 7.5 

 7.5 

 9.0 



18.34 



15... 



22. 59 



16 



22.70 



19 



21.23 







