192 JACQUES LOEB AND HARDOLPH WASTENEYS 



in this case was there any HkeUhood that the material was in 

 any way uniform and since only in this case the experiments 

 were carried on at the same temperature and the same conditions 

 of regeneration. 



The result was that the observed ratios were as 1.02 : 0.99 : 1.02 

 (with a probable error of ±0.01) M^hile the values calculated on 

 the assumption of the validity of the Bunsen-Roscoe law were 

 as 1 : 1 : 1; i.e., the results showed as great an approximation 

 between observed and calculated values as one could expect. 



These experiments carried on by a somewhat different method 

 from those previously published by Loeb and Ewald harmonize 

 with the idea that the Bunsen-Roscoe law is the correct expres- 

 sion of the influence of light upon the heliotropic reactions of 

 Eudendrium. 



