68 



formation to explain this sort of action, suggesting that 

 salts combine with the proteids of living protoplasm to 

 form ion-proteid compounds. He considers it possible that 

 one or both of the ions of the ant i- toxic salt may thus 

 combine with the proteid molecule. In his work with NaCl 

 he found that a solution of NaCl was ppisonous unless a 

 little calcium and potassium were present, and considers 

 that the ions of the last mentioned salts may be substit- 

 uted in the ion-proteid molecule of living matter. He sug- 

 gests that the organism cannot live without some of these 

 proteid compounds containing calcium and potassixon as well 

 as those containing sodiiom. 



The work of Csterhouf^^ on "balanced solutions" 

 also supports this theory of Loeb's. 



Cstwald^''' in his work on Gammarus concludes that the 

 toxicity of a solution is related to its power of being ad- 

 sorbed, and "dass eine Losung urn so gif tiger ist, je 

 starker sie adsorbiert wird." Ilorowitz^® considers that 



26. Osterhout, W. J. 7., Cn the importance of physiologically 

 balanced solutions for plants. I. Marine plants, l^.c.. 



II. Fresh water and terrestial plants. Bot. Gaz. 44:259-272- 

 1907. 



27. Cstwald, TTo., Ueber die Beziehungen zwischen Adsorption 

 und Giftigkeit von Salzlosungen fur Susswassertiere (Gammarus) 

 Pflugers Archivs 12C:19-3C .19C7 . 



28. Horowitz, Hugo, Ueber Adsorption und Kolloidfallung 

 Kolloid Chemische Beihefte l:3Cl-33^. 19C9-1C. 



