3 



The result shows that the presence of calcium in proper 

 proportion can exert only a beneficial action, while in the case 

 of barium, on the contrary, a depression resulted. Although 

 strontium in suitable proportion retarded the toxic action of 

 magnesium, it is far inferior to calcium. 



II. Experiment with NaCl. 



20 beakers, each containing 30 cc of culture fluids, served 

 for the experiment. The culture solutions were applied in the 

 same proportion as in Experiment I using NaCl instead of 

 MgCL. 



Five seedlings, about 20 mm high, were transplanted on 

 March 7th (1913) and kept in the green house. The evaporated 



water was supplemented with distilled wat 





to time 



^ ] t ed 



Lengtli 





o?roots 



Distilled water 30 cc. 



65 



50 





1/10 N. NaCl 30 cc. 



44 



13 





1/10 N. NaCl 25CC. + 1/10 N. CaCl^ 5 cc. 



70 



40 



9 



1/10 N. NaCl 20CC. + 1/10 N. CaCL 10 cc. 



70 



40 



9 



1/10 N. NaCl 15CC. + 1/10 N. CaCU 15 cc. 



60 



25 



8 



1/10 N. NaCl lOcc. + l/lO N. CaCl^ 20 cc. 



56 



20 





1/10 N. NaCl 5CC. + 1/10 N. CaCL 25 cc. 



50 



20 



6 



1/10 N. CaCl, 30 CO. 



44 





6 



1/10 N. NaCl 25 cc. 4- 1/10 N. BaCL 5 cc. 



40 



20 



3 



1/10 N. NaCl 20CC.+ 1/10 N. BaCl^ 10 cc. 



41 



18 





1/10 N. NaCl locc. + l/lO N. BaCL 15 cc. 



30 





: 



1/10 N. NaCl lOcc.+ l/lO N. BaCL 20 cc. 



30 



20 





1/10 N. NaCl 5CC. + 1/10 N. BaCl^ 25 cc. 







3 



1/10 N. BaCl, 30 cc. 



29 



10 



3 



1/10 N. NaCl 25CC. + 1/10 N. SrCl.2 5 cc. 



50 



22 



6 



1/10 N. NaCl 20CC. + 1/10 N. SrCL 10 cc 



47 



20 



4 



1/10 N. NaCl 15CC. + 1/10 N. SrCL 15 cc. 



45 



16 





1/10 N. NaCl lOcc. + l/lO N. SrCL 20 cc. 



40 



10 



4 



1/10 N. NaCl occ. + l/lO N. SrCL 25 cc. 



36 



16 



4 



1/10 N. SrCL 30 cc. 



28 



15 



3 



