138 



M. M. McCooL 



TABLE 3. Series 2. Experiment with Canada Field Pea. Duration, Thirty Days. 



Data for Ten Plants 



Composition of 



solution 



(1/10 nutrient 



solution as the 



solvent) 



Green 

 weight 

 of tops 

 (grams) 



Green 

 weight 

 of roots 

 (grams) 



Total 



green 



weight 



(grams) 



Color 

 of tops 



Remarks 



N/10 CaCL+N/lO 

 MgCL 



N/10 CaCl2+N/20 

 MgClj 



5.12 

 6.15 



5.77 



4.55 



6.57 



5.00 



6.80 



Weight 

 not taken 

 4.86 



6.00 



5.85 



2.65 



3.75 



4.37 



3.47 



4.27 

 4.10 

 4.25 

 No growth 

 1.75 

 3.75 



3.55 



7.77 



9.90 



10.14 



8.02 



10.84 



9.10 



11.05 



Dark green 



Dark green 



Light green 



Light green 



Green 

 Pale green 

 Light green 



Lateral roots verj^ 

 short 



Lateral roots very 

 short 



N/10 CaCl2+N/50 

 MgCh 



Lateral roots very 

 short 



N/10 CaCl2+ 

 N/lCO MgCk... 



N/100 CaCl2+ 

 N/50 MgCU 



N/10CaCl2 



N/100 CaCL 



N/10 MgCl2 



N/50 MgCh 



N/100 MgCL 



1/10 nutrient solu- 

 tion 



Lateral roots good 

 development 



Lateral roots good 

 development 



Lateral roots good 

 development 



Lateral roots good 

 development 



Practically dead 



Lateral roots short, 



dead 

 Lateral roots poor 



growth 



Lateral roots good 



6.61 

 9.75 



9.40 



Dark green 

 Dark green 



Green 



RELATIONS BETWEEN OTHER BASES 



Potassium and magnesium, sodium and magnesium 

 When wheat seedUngs are placed in solutions of potassium and mag- 

 nesium or sodium and magnesium chlorids (distilled water being the 

 solvent), mutual antagonism is evident. In Table 4 it may be noted 

 that N/1000 KCl can antidote the toxicity of N/500 MgCU as completely 

 as can N/50 KGl; while N/500 MgCl2 seems to be the best concen- 

 tration for antidoting N/50 KCl. The toxic action is manifest, particu- 

 larly in the development of roots. 



