Toxic AND ANTITOXIC EFrFrrcts 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 
| Percentage of 
Solution Eggs Yielding 
Embryos 
Tete eens 100 c.c. $m NaCl 3 
Deavees wees 100 se “ + tec. 7% Pb acetate 7 
Dieescak sees 100 Be ee tel se oe 17 
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. AICl,, 
Cr,(SO,), and FeCl, were used. The experiments with 
FeCl, 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 
Percentage of 
Solution Eggs Yielding 
Embryos 
US eldaasie Guo Get 100 c.c. §m NaCl 0 
oceteeas 100. “*  +he.c. 7%, AlCl, 0 
Dieses wraiciats 100 ef ah se 4 
A cuiaces ead 100 e « t+) es 25 
Deicccescopor en 8 100 os « +12 is 39 
G co ccciguasmreccin 100 ie “« +4 ee 25 
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