Toxicity of Various Cations 



TABLE 9— {continued) 



211 



Experiment with MgCL 



Steeped for twenty-four hours 

 in following solution 



Percentage 



of 

 germination 



Notes on condition of roots 



Distilled water 



96 to 98 



8 

 95 



96 



96 



Uniform germination. Roots 6.25 centi- 



N/1 MgCl2 



meters in length 

 Roots .3 centimeter long, dead 



N/3 MgCl2 



Great injury. Roots .3 to .6 centimeter 



N/5 MgClz 



long, curled 

 Great injury. Roots 1.22 centimeter long, 



curled 

 Slight injury. Roots 5 centimeters in length 



N/lOMgCh 





Experiment 



with KCl 



Steeped for twenty-four hours 

 in following solution 



Percentage 



of 

 germination 



Notes on condition of roots 



Distilled water 



96 to 98 



5 

 96 



96 



97 



Uniform germination. Roots 6.25 centi- 



N/1 KCl 



meters in length 

 Dead 



N/3KC1 



Three roots are normal, remainder show 



N/5 KCl 



great injury, 1.25 centimeter long 

 Great injury. Roots about 1.25 centimeter 



long 

 No injury 



N/10 KCl 







ExT3eriment with NaCl 



Steeped for twenty-four hours 

 in following solution 



Percentage 



of 

 germination 



Notes on condition of roots 



Distilled water 



96 to 98 





 90 



95 



96 



Uniform germination. Roots 6.25 centi- 



N/1 NaCl 



meters in length 



N/3 NaCl 



Great injury. Roots about .6 centimeter 



N/5 NaCl 



long 

 Great injury. Roots about 1.25 centimeter 



N/10 NaCl 



long 

 No appreciable injury 







