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 : 



N 

 11 

 and 

 lla. 



CaCl 2 . 



12. rCaC! 2 . 13. rrNaCl. 14. 



. . . . . 



N p, rl 2500 100 2500 



Lido ' 



15. | CaCl 2 and ^ NaCl. 18. JL CaCl 2 and L NaC1 . 



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. 



100 1UO 



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. 



BARTER, 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. B., and BARTER, L. L. The Comparative Toler- 

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



