718 



STUDIES IN GENERAL PHYSIOLOGY 



TABLE VIII 



Cu, and Hg ions. Had I not before demonstrated the anti- 

 toxic effects of so poisonous an ion as the zinc ion, such an 

 attempt would have appeared to me only ridiculous. With 

 copper acetate and mercuric chloride I obtained negative 

 results throughout, for these two ions are so poisonous indeed 

 that the small amount necessary to render inert the poison- 

 ous effects of a sodium -chloride solution are sufficient to 

 kill the egg or cause its coagulation. With lead ions, how- 

 ever, I had a distinct success. For the antitoxic salt lead 

 acetate was used, and for the toxic salt, sodium acetate. It 

 was proved that the latter was slightly more toxic than NaCl. 



TABLE IX 



In another case 40 per cent, of the eggs formed embryos. 

 The objection was here again at hand that the decrease in 

 the degree of the dissociation of the sodium acetate had 

 played a r6le. Although lead chloride is only very slightly 



