BUNSEN-ROSCOE LAW — ANIMAL HELIOTROPISM 



191 



TABLE 1 



^ Bracketed values being extreme variates are excluded from calculations 

 of the means and proba])lo errors. 



the Bunson-Roscoe law holds. On that assumption the ratio of 

 percentage bent in any two or all three dishes on any one day 

 should equal 1.0. These I'atios for each pair of distances of the 

 source of light are given in the three other columns of the table. 

 The percentage bending was only compared in dishes contain- 

 ing material regenerated and exposed on any one day, since onlj^ 



