212 



M. M. McCooL 



TABLE 9— (concluded) 



Experiment with NH4CI 



Steeped for twenty-four hours 

 in following solution 



Percentage 



of 

 germination 



Notes on condition of roots 



Distilled water 



96 to 98 











30 



75 

 80 



Germination uniform. Roots 6.25 centi- 



N/1 NH4CI : . . 



meters long 



N/3 NH4CI 





N/5 NH4CI 



Roots about 1.25 centimeter long 



N/10 NH4CI 



Roots show great injury 



N/2ONH4CI 



Roots show slight injury 



Experiment with MnCL 



Steeped for twenty-four hours 

 in following solution 



Percentage 



of 

 germination 



Notes on condition of roots 



Distilled water 



96 to 98 



6 

 94 



96 

 97 



98 



Germination uniform. Roots 6.25 centi- 



N/lMnCl2 



N/3 MnCh ■ 



meters long 

 Roots dead, barely emerged 

 Great injury. Roots .6 to 1.25 centimeter 



N/5 MnCl2 



long 

 Great injury. Roots 1.25 centimeter long 

 Two roots are about normal, remainder 



N/10MnCl2 



N/50MnCl2 



show great injury 

 Twenty-five roots are about normal, re- 





mainder show injury 



The ions of magnesium, sodium, potassium, and calcium are injurious 

 in the order given, magnesium being only slightly more harmful than either 

 sodium or potassium. Of the salts tested, NH4CI alone inhibits germi- 

 nation at N/3 concentration. 



In general these results are similar to those obtained by Magowan 

 (1908), who germinated wheat seeds in pure solutions of certain salts 

 and allowed them to remain in the solutions for thirty days. It was 

 found that magnesium chlorid, sodium chlorid, potassium chlorid, and 



