258 I>r. A. Id .-n, Dr. G. H. Morris. an-1 Mr. S. i:,i\vl:inl. 



experiments to determine the most favourable concentration of sugar ; 

 the results show that the smaller amounts 5 to 10 per cent. give 

 the most favourable results, whilst the larger quantities sensibly retard 

 the action, i.e., less gas is obtained from the juice plus sugar than from 

 the juice alone. This probably explains to some extent the results we 



Fro. 2 

 7-0 



Showing the influence of ag of 



after 48 hours. 



expressed juice 



6-0 



3-0 





3-0 



/O 



o 

 \ 







\ 



&4 C - uncorrected for&uCo-fermwitaCion. 







Age of yeAaC in days. 



obtained in our earlier experiments in which 40 per cent, of sugar was 

 employed. Some of the results are shown diagrammatically in fig. 3. 

 Influence of different Sugars. In order to determine if the nature of 

 the sugar employed had any influence on the amount of gas evolved, we 

 carried out a series of experiments with cane-sugar, dextrose, maltose, 

 and levulose at different concentrations, using the same sample of juice 



