Equilibrium in the Intake of Salts by Plant Cells. 



453 



noted that the curves for the absorption from the calcium chloride solutions 

 show that the uptake of calcium chloride is only about a quarter of that of 

 sodium or potassium chloride from solutions of the same equivalent concen- 

 trations. The metal ion is, of course, less concentrated in the case of calcium 

 chloride for solutions of equal normality, but this is insufficient to account 

 for the difference in amount of absorption. 



Table IV. — Absorption of Sodium Chloride by Potato Discs as Measured by 

 Changes in Conductivity of External Solution. 







Observed. 





Calculated putting distilled water = 0. 





















Hours. 





















D. H,0. 



N/SOU. 



N/50. 



N/IO. 



D. K,0. 



N/500. 



N/50. 



N/10. 



1-15 



+ 69 



+ 48 



- 53 



-550 







- 21 



-122 



- 619 



14 -00 



+ 306 



+ 277 



+ 215 



-330 







- 29 



- 91 



- 636 



19 -40 



+ 452 



+ 393 



+ 300 



-343 







- 59 



-152 



- 795 



38 -iO 



+ 681 



+ 620 



+ 348 



-367 







- 61 



-333 



-1048 



47-16 



+ 746 



+ 614 



+ 298 



-720 







-132 



-448 



-146ii 



62 -00 



+ 666 



+ 557 



+ 287 



-730 







-109 



-479 



-1396 



86 -GO 



+ 656 



+ 498 



+ 207 



-647 







-158 



-449 



-1303 



Discs -washed 2| hours, running tap water and five changes of distilled T>'ater. 



