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 



- 1 



- 2 



FE" 3 Ni H 

 Co PB 



Cu HG 4 Ac 



1 MG 2 MN ZN 



X=Ionic Potentials.. 

 FIG. 4. Plot of results obtained with eggs of Fundulus heteroclitus. Ordinates and abscissae 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 



