34 BULLETIN &83, U. S. DEPARTMENT OF AGRICULTURE. 



Series Ilia. 

 1.4 per cent of H2SO4; 125 per cent of II2O; 7.5 atmospheres. 





Time of 

 cook, min- 

 utes. 



Per cent of 



total 



sugars. 



Per cent of 



total 

 sugars fer- 

 mentable. 



Alcohol yields. 



Cook No. 



Per cent of 

 dry wood. 



Gallons ab- 

 solute per 

 ton. 



33 









 



23.17 

 23.74 

 22.37 



54.20 



53.67 

 53. 92 



6.972 

 6.319 

 6.214 



21.09 



40 



19.11 



39 1 



18.80 













23.46 



53.94 



6.646 



20.10 









24 



10 



23. SI 

 23.09 



53.16 

 56.99 



6.362 

 6.550 



19.24 



41 



Average 



42 



10 



19.81 



10 23.45 



55. 08 



6. 456 ) 19. 53 



30 



22. 34 



63. 22 



6.862 



20.70 



1 Blow-off open, not averaged 

 120 



too 



Z 80 



«/> 



u 60 



§ 40 



20 



.-Pl^ciB 



-S 



2, 



Si 



ACID/ 



M 



ACID 



*K 



>0 "55 60 65 70 75 



°/o OF TOTAL SUGARS. FERMENTABLE 



80 



UP3S 



18 20 22 '24 



YIELD OF TOTAL SUGARS IN 

 °/o OF DRY WEIGHT OF WOOD 



Fig. 3.— Series III and Ilia, showing the variation in yield of total sugars and percentage of total sugars 

 that is fermentable with varying cooking periods at two different acid concentrations. Cooking pressure, 

 7.5 atmospheres. 



These results are further illustrated graphically in figures 3, 4, 

 and 5. 



In a previous publication, 40 based on preliminary series III, the 

 author stated that the time of cooking was apparently without 

 effect. This statement was based on a total sugar data only, as 

 practically all other alcohol data up to that time had been, and must 

 now be, modified. 



Altogether three concentrations of acid and two concentrations 

 of water were used, except in cook 21, as noted in the table. For 



"Jour, of Ind. and Eng. Chem. 1914, 625. 



