Toxic AND ANTITOXIC EFFECTS OF IONS 719 



soluble, I tried to see if the few lead ions that go into solu- 

 tion when lead acetate is added to sodium chloride would 

 still suffice to weaken the poisonous effects of a pure NaCl 

 solution. Such was indeed the case. 



TABLE X 



In the remaining solutions the number of embryos could 

 not be determined, since the eggs had been rendered opaque 

 by the precipitation of the lead salts. 



5. Experiments were now made to see if it were possible 

 to annihilate the toxic effects of a sodium-chloride solution 

 through the addition of salts having a trivalent ion. A1C1 3 , 

 Cr 2 (SO 4 ) 3 and FeCl 3 were used. The experiments with 

 Fed 3 all yielded negative results. No concentration could 

 be found at which this salt exhibited antitoxic properties. 

 Perhaps the strongly acid character of this solution had 

 something to do with this result. The experiments with the 

 two other salts, however, yielded positive results. 



TABLE XI 



