166 M. M. McCooL 



2. Although mutual antagonism results when cations are present together 



in solution as follows: 



yig and Sr Na and K 



K and Sr Na and XH3 



Xa and Sr K and Ba 

 IMg and Ba 



yet calcium is the most effective of any of the substances studied, in 

 preventing toxic action. 



3. Protective action is not confined to the so-called essential nutrients, 

 since, as incUcated above, Xa, Sr, and Ba (the nonessential ions among 

 those here discussed) possess this property. 



4. The favorable results obtained from the application of lime to many 

 t^^Des of soils is doubtless due in part to the antidotal relations. 



BIBLIOGRAPHY 



Aso, K. 



1903 The influence of a certain ratio between lime and magnesia on 



the gro\^i:h of the mulberrv tree. Tokvo Imp. Univ., Agr. 

 Col. Bui. 5:495-499. 



1904 On the influence of different ratios of lime to magnesia on the 



gro^^'th of rice. Tokyo Imp. Univ., Agr. Col. Bui. 6:97-102. 

 1909 On the influence of the ratio of lime to magnesia upon the 

 yield in sand culture. Tokvo Imp. Univ., Agr. Col. Journ. 

 I : 175-180. 



Bemardini, L., and Corso, G. 



1908 [Italian title.] Concerning the influence of various relations 

 between lime and magnesia on the development of plants. 

 Staz. Sper. Agr. Ital. 41: 191-208. 



Bemardini, L., and Siniscalchi, A. 



1908 Intorno alhinfluenza di vari rapporti fra calce e magnesia suUo 

 sviluppo delle piante. R. Scuola Sup. Agr. Portici. Ann. 

 2ser.:8:l-19. 



Crawford, A. C. 



1908 Barium, a cause of the loco-weed disease. U. S. Agr. Dept., 

 Plant Indus. Bur. Bui. 129:1-87. 



