Special Functions and Relations 193 



The above series should show toxicity of the magnesium salt 

 and antagonism. 



In the same manner as for the preceding prepare solutions 

 to contain the following : 



and 



Cad* 



25 12. CaCl*. 13. NaCl. 14. 



XT . . . . . 



N P 250 10 2500 



lioo c 



15. | Cad, and Nad. 18. CaCl 2 and NaCL 



16. CaCl-2 and -- NaCl. 19. - CaCl 2 and nutrient sol. 

 25 2500 25 



17. ^L CaCl 2 and -^- NaCl. 20. ~ NaCl and nutrient sol. 



Permit the plants to grow under favorable conditions four- 

 teen days, supplying distilled water as needed by transpiration. 

 Discuss the results, tabulate data on length and green weight ; 

 also plot curves of the total green weight in the two series. 



REFERENCES 



DUGGAR, B. M. The Relation of Certain Marine Algae to Vari- 

 ous Salt Solutions. Trans. Acad. Sci., St. Louis. 16:473- 

 489, 1906. 



HANSTEEN, B. Ueber das Verhalten der Kulturpflanzen zu den 

 Bodensalzen. Jahrb. f. wiss. Bot. 47 : pp. 289-377, 1 pi., 

 19 figs., 1910. 



HARTER, L. L. The Variability of Wheat Varieties in Resist- 

 ance to Toxic Salts. Bur. Plant Ind., U. S. Dept. Agl. Bui. 

 79: 48 pp., 1905. 



KEARNEY, T. H., and CAMERON, F. K. Some Mutual Relations 

 between Alkali Soils and Vegetation. U. S. Dept. Agl. 

 Report. 71 : 78 pp., 1902. 



KEARNEY, T. H., and HARTER, L. L. The Comparative Toler- 

 ance of Various Plants for the Salts Common in Alkali Soil, 

 o 



