s.; 



University of California Publications in Agricultural Sciences [Vol. 3 



C 

 KC1 



F G H I J K 



Concentration of salts 



M N O 



CaClo 



Fig. 7. — Curves of yeast growth showing antagonism between KC1 and CaCh. 

 The onlinates represent the number of yeast cells in millions and the abscissae, 

 the concentration of salts in combination. The ordinate at A represents the 

 number of yeast cells in blank cultures. 



For comparison with these results, a number of cases dealing with 

 plants, animals and bacteria may be cited below: 



(a) Plants. — Osterhout 22 has shown that for higher plants a com- 

 bination of 100 c.c. KC1 and 5 c.c. CaCL at the concentration of .12M 

 is besl suited for the highest development of roots. Benecke 19 has 

 shown that for lower plants (Spirogyra) the harmful effect of the K 

 ion is very distinctly antagonized by the addition of the Ca ion at a 

 certain definite concentration. 



