Jan. 2, 1920 



Lime and Sodium-Chlorid Tolerance of Wheat Seedlings 355 



the presence of a small amount of calcium chlorid and that barium and 

 strontium exerted a similar action. J. Loeb/ in his work on the effect 

 of various salts on fishes, concluded similarly that the antagonism of the 

 calcium salts toward certain toxic salts was due to their effect on the 

 permeability of the cell. 



Series 14 was introduced to determine the effect of small amounts of 

 lime on the actual absorption of sodium chlorid as shown by the analysis 

 of the ash. 



The following solutions were used: 



SOLUTION NO. 



CONCENTRATION OF SOLDTION. 



1 Distilled water. 



2 4,000 parts per million of sodium chlorid. 



3 4,000 parts per million of sodium chlorid + 30 parts per million of cal- 



cium oxid. 



When the plants were 8 days old, 100 were withdrawn from each pan 

 and the amount of ash and chlorin estimated. Tables I and II give the 

 results of the analyses. 



Table I. — Analyses of 100 tops 



Concentration of solution. 



Chlorin, 

 calculated 

 to sodium 



chlorid. 



Distilled water 



4,oco p. p. m. of sodium chlorid 



4,oco p. p. m. of sodium chlorid + 30 p. p. m. of calcium oxid 

 100 whole seeds, ungerminated 



Table 11.— Analyses of 100 whole plants 



Concentration of solution. 



Dry 

 weight. 



Chlorin. 

 calculated 

 to sodium 



chlorid. 



Distilled water 



4,000 p. p. m. of sodium chlorid 



4,000 p. p. m. of sodium chlorid + 30 p. p. m. of calcium oxid. 



Gm. 

 Trace, 

 o- 0553 

 •0595 



Upon repeating this experiment with three different sets of plants, 

 similar results were obtained each time, showing that there was just as 

 much chlorin in the plants growing in the solution containing lime as in 

 those grown in the solution containing no lime. Within the limits of 

 our experiments, lime is not effective in preventing absorption of sodium 

 chlorid by the plant. 



' LoEB, Jacques. i;ber dib hemmung der GiFTwrttKUNG von Naj, NaNos, NacNS tjnd andbrSN 

 NATRTUMSALZEN. In Biochem. Ztschr., Bd. 43, Heft 3, p. 181-202. 1912. 



