DISCUSSION OF CHEMICAL DATA. 



65 



substance present other than levulose, which as yet has not been 

 identified. 



Comparison of amounts of sucrose equivalents of 1 per cent of reducing sugar when large 

 and small amounts are present. 



LARGE AMOUNTS OF REDUCING SUGAR. 



SMALL AMOUNTS OF REDUCING SUGAR. 



UNDETERMINED MATTER. 



This figure is obtained by difference and hence is more or less 

 influenced by the accuracy of the other determinations. The high- 

 est figure noted was 4.51 per cent and the lowest was zero, while in 

 32 samples the sum of the determined data is above 100 per cent, the 

 greatest excess being 0.73 per cent. The average undetermined mat- 

 ter amounts only to 1 .08 per cent. Assuming that the ash, as weighed, 

 is in the carbonate form and that such carbonates come from the 

 breaking down of the malic acid, supposed to be the principal acid 

 present, a part of the undetermined matter, in fact nearly three- 

 quarters of it, would be accounted for in the transition of the 1 per 

 cent of average ash from the carbonate to the malic-acid stage. 



POLARIZATIONS. 



The average of the direct polarizations of all the samples is + 60.64 

 V.; the extremes are from +69.00 V. to +42.10 V. In the invert 

 polarization, the average is -22.34 V., while the extremes are 

 -24.97 V. to -17.00 V. Out of the 481 samples 23 showed a 

 48874 Bull. 13410 5 



