ETHYL ALCOHOL FftOM WOOD WASTE. 



37 



In the experiments of series IV, 1.80 per cent of sulphuric acid 

 was used. The experiments were then repeated with the use of 100 

 and 200 per cent of water with 1.40 per cent of sulphuric acid, and 

 the results were the same. These results are shown graphically in 



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3 4 5 6 7 8 9 10 



YIELD OF ALCOHOL IN % OF DRY WEIGHT OF WOOD 



Fig. 6. — Series IV and IVa, showing variation in alcohol yields with varying concentrations of water at 

 two different acid concentrations. 



figures 6 and 7. Figure 6 shows that the average alcohol yields 

 were very nearly constant for the different concentrations of water 

 used, and figure 7 shows that this also held true for both the amounts 

 of total sugars and the percentages of sugars that were fermentable. 



