166 



RUTH L. PHILLIPS 



TABLE Oc 



Summarizing the data contained in tables 6a, and 6b, for the time from November 6, 

 1920, to December 28, 1920 



due to a depressing effect of the medium. It is just as probable 

 that the change in environment in a culture which was becoming 

 unsatisfactory was enough to cause the death of the animals. 

 Had the food in the mixture M been as satisfactory as was the 

 case when this was first used, it is not likely that the death rate in 

 the new medium would have been greater. 



The second infusion tested was made of entirely different 

 material, the dry, uncured, succulent moneywort, Lysimachia 

 riummularia L. It presumably had a different chemical compo- 

 sition than either of the other infusions used. As in the case 

 of the uncured swamp hay, it was tested in connection with 

 controls in the standard 0.1 per cent hay infusion. The effect 

 of using this infusion is shown in table 7. 



The first impression one gains from a study of this table is that 

 the change from hay infusion to moneywort produced a marked 

 increase in metabolism of the animals thus treated. The signif- 

 icance factors for these changes do not indicate that this was 

 the case save for the mixture A'B'C However, since there was 

 a stimulating effect of the medium in this one case, we are justified 

 in concluding that this particular change in medium tended to 

 be stimulating rather than depressing or without effect. 



