Pharmacodynamics of Salts and Drugs 



109 



The ordinates represent the logarithms (common) of the dilution 

 (V) of the minimum fatal dose; the abscissae represent the differences 

 between the ionic potential of the cation of the colloid, which is assum- 

 ed to be potassium at 2.9 volts and the ionic potential of the various 



> 



I 



Mg 2 Mn Zn 

 X= Ionic Potentials. 



Cd 3 H 

 Co 



Cu 



Hg 4 Ac 



Fig. 3. Plat of results obtained with diastase. Ordinates are the logarithms of the dilution of the 

 minimum fatal dose. Abscissse represent the difference between the ionic potentials of K.. Cl and poten- 

 tials of ions of toxic salts, 



metals. The line makes an angle with the A'"-axis, the tangent of 

 which is 2.23, and it cuts the F-axis at — 4. 11 (or C). 



The remarkable closeness with which the various metals approxi- 

 mate to this line will be apparent. 



