504 Rate of Absorption of Various Salts by Plant Tissue. 



present to make a suggestion. Our results are that the divalent ions, Ca, Mg, 

 and SO4, are at the final equilibrium absorbed to a much less extent than the 

 monovalent ions, K, Na, CI, and NO3. 



LITERATUEE CITED. 



(1) Fitting, H. " Untersuchungen iiber die Aufnahme von Salzen in die lebende Zelle." 



' Jahrb. Wiss. Bot.,' vol. 56 (Pfeflfer-Eestschrift), pp. 1-64 (1915). 



(2) Hind, M., "Studies in Permeability. III. — The Absorption of Acids by Plant 



Tissue," 'Ann. of Bot.,' vol. 30, pp. 223-228 (1916). 



(3) Landolt, H., and Bornstein, R. " Pbysikalisch-chemische Tabellen," Berlin, 4. Aufl., 



1912. 



(4) Meurer, R " tlber die regulatorische Aufnahme anorganischen StoflFe durch die 



Wurzeln von Beta vulgaris und Daucus carota," ' Jahrb. Wiss. Bot.,' vol. 46, 

 pp. 503-567 (1909). 



t'(5) Nathansohn, A. "Ueber die Regulation der Aufnahme anorganischen Salze durch 

 die Knollen von Dahlia," 'Jahrb. wiss. Bot.,' vol. 39, pp. 607-644 (1904). 



(6) Nathansohn, A., " Weitere Mitteilungen iiber die Regulation der StofFaufnahme," 



' Jahrb. Wiss. Bot.,' vol. 40, pp. 403-442 (1904). 



(7) Pantanelli, E. "Uber lonenaufnahme," 'Jahrb. Wiss. Bot.,' vol. 56 (Pfeffer- 



Festschrift), pp. 689-733 (1915). 



(8) Rothert, W. " Das Verhalten der Pflanzen gegeniiber Aluminium," ' Bot. Zeit.,' 



vol. 64, Abt. 1, pp. 43-52 (1906). 



(9) Ruhland, W. " Beitrage zur Kenntnis der Permeabilitat der Plasmahaut," ' Jahi'b. 



Wiss. Bot.,' vol. 46, pp. 1-54 (1909). 

 10) Ruhland, W. " Zur Frage der lonenpermeabilitat," ' Zeitschr. f. Bot.,' vol. 1, 

 pp. 747-763 (1909). 



(11) Stiles, W., and Jorgeusen, I. " Studies in Permeability. I. — The Exosmosis of 



Electrolytes as a Criterion of Antagonistic Ion-Action," 'Ann. of Bot.,' vol. 29, 

 pp. 349-367 (1915). 



(12) Stiles, W., and Kidd, F. "The Influence of External Concentration on the Position 



of the Equilibrium attained in the Intake of Salts by Plant Cells." 'Roy. Soc. 

 Proc.,' B, vol. 90, pp. 448-470 (1919). 

 13) Troendle, A. " Sur la permeabilite du protoplasme vivant pour quelques sels." 

 ' Arch. Sci. Phys. et Nat.,' 4<^ Per., vol. 45, pp. 38-54, 117-132 (1918). 



