122 SOME RECENT RESEARCHES IN PLANT PHYSIOLOGY 



TC T 



centage of JE namely, as x 100. Similarly, the increase 



J xL 



of toxicity -which is occasionally met with may be repre- 



TTT 



sented by . 



Osterhout has illustrated his method by the following 

 table. The percentages refer to molecular proportions. 

 More recently (1914, 7) he has shown that the form of 

 the antagonism curve is also dependent upon how long 

 the cells have been in contact with the salt solution. 



TABLE XXXI. 



MIXTURES OF EQUALLY Toxic SOLUTIONS. 

 WHEAT (growth during thirty <%s) NaCl 0-12 N+ CaCl 2 0-164 N. 



Osterhout emphasizes the fact that the growth of parts 

 not in immediate contact with the solutions does not 

 furnish a trustworthy criterion of antagonism. 



