380 BOTANICAL GAZETTE [OCTOBER 
Concentrations of sodium chloride which were strongly toxic to 
wheat seedlings were antidoted by 30 parts per million of calcium 
oxide. 
The most successful antagonism in the concentrations employed 
was found when the Na:Ca ratio was 98:2. At this ratio the 
calcium was not found to exclude sodium from the plant, but to 
render it harmless after entrance. The antagonism appears to be 
internal rather than peripheral. 
UNIVERSITY OF CALIFORNIA CitRUS EXPERIMENT STATION 
RIVERSIDE, CAL. 
