Relations of Manganese and Other Cations 191 



TABLE 9. Experiment Continued for Thirty Days. Data for Ten Plants 



Composition of solution 

 (full nutrient solution as the 

 solvent) 



Green 



Green 



Total 



Average 

 length 

 of tops 

 (centi- 



weight 



weight 



green 



of tops 



of roots 



weight 



(grams) 



(grams) 



(grams) 



meters) 



0.50 



1.46 



1.96 



1 



5.05 



4.95 



10.00 



11 



7.36 



6.35 



13.71 



13 



0.45 







1 





2.55 



5.55 



8.10 



4 



0.35 



1.75 



2.10 



1 



2.55 



4.20 



6.75 



5 



7.19 



4.85 



12.04 



13 



0.37 



2.30 



2.67 



1 



2.10 



4.90 



7.00 



5 



3.15 



4.60 



7.75 



7 



1.60 



4.26 



5.86 



2 



2.10 



3.80 



5.90 



4 



1.00 



2.95 



3.95 



2 



2.25 



4.00 



6.25 



4 



2.70 



4.45 



7.15 



6 



6.90 



4.65 



11.55 



14 



9.75 



7.15 



16.90 



16 



9.10 



5.60 



14.70 



12 



10.85 



6.15 



17.00 



15 



10.20 



5.45 



15.65 



14 



9.90 



4.90 



14.80 



14 



10.40 



5.20 



15.60 



13 



Average 

 length 

 of roots 

 (centi- 

 meters) 



N/10 CaCl2+N/50 MnCL. . . , 

 N/10 CaCl2-|-N/100 MnClj. . 

 N/10 CaCl^-f-N/oOO IMnClo. . 

 N/50 CaCl2+N/50 MnCh. . . . 

 N/50 CaCl2-f N/100 MnCb. . 

 N/100 CaC1.2+N/50 MnCh. . 

 N/100 CaCl.+N/lOO ]MnCl2. 

 N/100 CaCl2-FN/500 MnCh. 

 N/500 CaCl2+N/50 MnCh. . 

 N/500 CaCl2-FN/100 MnCL. 

 N/500 CaCl2+N/200 jMnCU. 

 N/1.000 CaCh+N/lOO MnCl 

 N/1,000 CaCl2+N/200 MnCI 



N/50 MnCl2 



N/100 MnCU 



N/200 I\lnCl2 



N/500 ]\InCl2 



N/10 CaCL. 



N/50CaCl2 



N/100 CaCl2 



N/500 CaCl2 



N/1,000 CaCl2 



Full nutrient solution 



6 

 8 

 11 

 15 

 12 

 11 

 10 

 11 

 12 

 14 

 12 

 13 

 13 

 15 

 13 

 13 

 12 

 10 

 12 

 10 

 16 

 9 

 10 



Calcium and manganese {soil cultures) . — It is of special interest and of 

 great economic importance to ascertain whether the toxicity of manganese 

 in soils may be reduced by the application of lime. The wTiter has found 

 fromx repeated experiments that large applications of lime to pots of soil 

 overdosed with manganese result in a more vigorous development of 

 the plants in the pots. 



In these experiments glass tumblers were used as containers. In each 

 tumbler was placed 250 grams of air-dr}^ sandy loam, to which was added 

 80 cubic centimeters of the solutions employed. Ten pea seedlings were 

 used in each tumbler, the roots growing into the moist soil through 

 a hole in the paraffin that had previously been applied to the surface of 

 the soil. Subsequently the number of plants was reduced to five in each 

 tumbler. The water lost from the soil was replaced from time to time 



