176 INJURY, RECOVERY, AND DEATH 



which salts were added to the soil, but it is very difficult 

 to separate the effects of the added salts from those 



a) 



Q 



.2 



8 



(S 



Min. 5 



Fig. 77. — Curves showing the resistance of Laminaria affardhii in 1,1 M sodium acetate, in 

 0.36 M sodium sulfate, and in mixtures of both: A in equal parts (by volume) of acetate and 

 sulfate; B in acetate 75, sulfate 25; C in acetate; D in acetate 25, sulfate 75; E in sulfate. 

 Ordinates represent net electrical resistance (expressed as per cent, of the original resistance in 

 sea water which is taken as 100%). Each point represents the average of ten experiments: 

 probable error of the mean less than 5% of the mean. 



of salts already present in. the soil. Miyake (1913) found 

 some antagonism among anions in studying the growth of 

 rice. Fenn (1918) has called attention to the fact that this 

 kind of antagonism is commonly met with in experiments 

 on gelatin. 



