THE PHYSIOLOGICAL EFFECTS OF IONS 481 



bring about approximately the same change in weight as a 

 NaCl solution of the same osmotic pressure. 1 



7. Sodium and potassium carbonate bring about an 

 absorption of water by the muscle in consequence of the 

 hydroxyl ions contained in the solution of these salts. 



8. The relative toxicity of the group of ions Li, Na, K, 

 Rb, Cs for muscle runs parallel with the velocities of the 

 migration of these ions and not with their atomic weights. 

 A similar parallelism exists between the velocity of the ion 

 and its relative toxicity in the group Be, Mg, Ca, Sr, and 

 Ba. Such a relation is, of course, to be expected only 

 between ions which belong to the same narrow group in the 

 periodic system. 



1 When the duration of the experiment is short. [1903] 



