BY R. GREIG-SMITH. 



279 



The Influence of Dextrose and Levulose upon Saccharose in 

 Presence of Calcium Carbonate and Sodium Phosphate. 





Pea (Krai) Bean (Krai) 



French Bean 



Pea (March) 



Saccharose =10 



Dextrose 



Levulose 



10J 10+ 

 13+ 21+ 



16+ 19+ 



lot 



18J 



7+ 



10J 



8+ 

 9+ 



Saccharose actual yield 



3 2 



6 



4 



Although the experiment bears out the idea that the low 

 yields with levulose were due to the formation of acid, they are, 

 however, subject to some discount, for at the end of the experi- 

 ment the surfaces of the plates were acid to litmus in spite of 

 the fact that the medium was white from the presence of calcium 

 carbonate. 



The action of dextrose upon saccharose in the case of the Lupin 

 race from Krai was very marked, and in the following experiment 

 it will be seen that even very small amounts of dextrose have a 

 considerable depressing effect upon this race. 



The Depressing Influence of small Quantities of Dextrose upon 

 Saccharose. 



Dextrose added to 

 the 2% saccharose- 

 citrate medium. 



None 



001 



0-05 



o-i 



0-2 



0-6 



1-0 



2 



25 



4% 

 3 



Lupin (Krai) .. 



23 



22 



13 



9 



2 



1 



i 



2 



2 



In testing the influence of several nitrogenous nutrients, 

 amounts of substances containing equivalent quantities of nitrogen 

 corresponding to 006% of asparagin were employed. 



