[Vol. 2, 1915] 



498 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



, and Sainsbury, H. ('94) . The action of potassium, sodium, and calcium 



salts on Tubifex Rivulorum. Ibid. 16: 1-9. 1894. 



Schreiner, 0., and Reed, H. S. ('07). The r6le of the oxidizing power of roots in 

 soil fertility. Jour. Biol. Chem. 3:XXIV-XXV. 190G-1907. 



Schulze, E. ('91). Ueber das Verhalten der Lupinenkeimlinge gegen destillirtes 

 Wasser. Landw. Jahrb. 20: p. 230. 1891. 



Sjoqvist, J. ('95.) Physiologisch-chemische Beobachtungen iiber Salzsiiure. Skand. 

 Archiv f. Physiol. 5:277-376. pi. 7-8. 1895. 



Stiles, W., and Jorgensen, I. ('14) . The measurement of electrical conductivity as 

 a method of investigation in plant physiology. New Phytol. 13:220-242. f. 

 1-5. 1914. 



True, R. H. ('14) . The harmful action of distilled water. Am. Jour. Bot. 

 1:255-273. f. 1. 1914. 



, and Bartlett, H. H. ('12). Absorption and excretion of salts by 



roots, as iniluenced by concentration and composition of culture solutions. 

 I. Concentration relations of dilute solutions of calcium and magnesium 

 nitrates to pea roots. U. S. Dept. Agr., Bur. PI. Ind., Bui. 231: 1-3G. pi. 



1 f. 1-21. 1912. 



1 1 9 ('15). The exchange of ions between the roots of Lupinus 



albus and culture solutions containing one nutrient salt. Am. Jour. Bot. 

 2:255-278. f. 1-13. 1915. 



, ('15a). The exchange of ions between the roots of Lupinus 

 albus and culture solutions containing two nutrient salts. Ibid. 2:311-323. 



f. 1-3. 1915. 



Wiichter, W. ('05). Untersuchungen iiber den Austritt von Zucker aus den Zellen 

 der Speicherorgane von Allium Cepa und Beta vulgaris. Jahrb. f. wisa. 



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Walker, J. ('10). Introduction to physical chemistry. London, 1910. [See 

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Whitney, M., and Briggs, L. J. ('97). An electrical method of determining the 

 temperature of soils. U. S. Dept. Agr., Div. Soils, Bui. 7: 1-15. f. 1. 1897. 



, Gardner, F. D., and Briggs, L. J. ('97). An electrical method of de- 



termining the moisture content of arable soils. Ibid. G: 1-20. f. 1-6. 1897. 



and Means, T. H. ('97). An electrical method of determining the 



soluble salt content of soils, with some results of investigations on the 

 effect of water and soluble salts on the electrical resistance of soils. Ibid. 

 8: 1-30. f. 1-6. 1897. 



Winckler, A. ('04). 1st destilliertes Wasser ein Gift? Zeitschr. diiitet. u. phys. 

 Therapie 8: 567-571. 1904-1905. 



Woodward, J. (1099). Some thoughts and experiments concerning vegetation. 

 Roy. Soc. London, Phil. Trans. 21: 193-227. 1099. 



