BY R. GREIG SMITH. 237 



appeared worthy of experimental enquir}^, and accordingly experi- 

 ments were made with the following results : — 



The Influence of Galactose upon" Levulose and Dextrose upon 



Maltose. 



The results are interesting in showing that galactose behaves 

 like dextrose in prohibiting the slime-formation from levulose. 

 It is rather more pronounced in its action, as can be seen by 

 comparing the experiment with that on page 231. Dextrose pro- 

 hibits the formation of gum from maltose, and since it acts 

 similarly with levulose, there is the probability that it does so 

 with every sugar. The same may be said of galactose, which, as 

 shown in the single test, depresses the yield from maltose. The 

 experiment serves to confirm what I have already said regarding 

 the improbability of gum being derived even from the most easily 

 attacked celluloses. 



The optiinum tempeyature. — An air temperature of about 17'' 

 had given the best results when growing slime upon saccharose- 

 potato tannin-agar media. Further trials, however, appeared 

 advisable, so that the weights of slime at different temperatures 

 could be given. Three experiments were made; the first suggested 

 the second, and a third was also made. 



* Sugars variable, asparagine O'l, tannin 0"1, asparagine O'l, agar 2, water 100, 



