no 



A. P. Mathews 



If now we turn to my results on Fundulus (Fig. 4), two things are 

 at once clear from an inspection of Table 6 and Fig. 4. The first 

 result is that the gradient or slope of the line which represents the rela- 

 tion between toxicity for Fundulus eggs and the ionic potential is 



Fe" 3 Ni H 

 Co Pb 



Hg 4 AG 



Mg 2 Mn Zn 



X=Iomc Potentials. 



Fig. 4. Plot of results obtained with eggs of Fundulus heterodilus. Ordinates and abscissa: as in 3. 



exactly the same as that found for diastase. This must be regarded 

 as confirmatory evidence of some value of the probable correctness 

 of our attempt to work out a numerical relationship between 

 toxicity and ionic potential. The second result which is very 

 clear is that there is in the case of Fundulus greater variations than in 



