5 



The crops used were millet, cowpeas and buckwheat, all of 

 which have been found to give excellent growth in pots. Neutral 

 sodium arsenite was applied to the pots in varying amounts as 

 shown in the following table: 



EFFECT OF ABSENT C ON PLANT GROWTH. 

 BUCKWHEAT 







Wt. of 





Wt. of 





Wt. of 







Arsenic 



air dry- 



No. of 



air dry 



No. of 



air dry 



No. of 



Pot 



in soil 

 per cent. 



plants 

 gms. 



plants 



plants 

 gms. 



plants 



plants 

 gms. 



plants 



1 



.011 



15.0 



5 



16.0 



5 



44.6 



5 



2 



.005 



7.2 



5 



16.4 



5 



45.5 



5 



3 



.010 



12.8 



5 



18.7 



5 



51.0 



5 



4 



.015 



8.3 



4 



15.0 



5 



49.3 



5 



5 



.050 







8.5* 



3 



14.8 



3 



6 



.100 







11.6* 



5 







7 



.250 















8 



check 



22.0 



5 



13.8 



5 



45.3 



5 









COWPEAS. 













Wt. of 





Wt. of 





Wt. of 







Arsenic 



air dry- 



No. of 



air dry- 



No. of 



air dry 



No. of 



Pot 



in soil 

 per cent. 



plants 

 gms. 



plants 



plants 

 gms. 



plants 



plants 

 gms. 



plants 



1 



.001 



82.5 



4 



161.0 



4 



206.5 



5 



2 



.005 



65.0 



4 



61.0 



2 



107.0 



2 



3 



.010 



40.0 



4 



92.0 



1 







4 



.015 



49.0 



4 



114.0* 



5 



22.0 



1 



5 



.050 



12.2* 



4 



39.0* 



2 



14.0* 



1 



6 



.100 















7 



.250 















8 



check 



51.5 



4 



129.5 



3 



202.0 



5 









MILLET 













Wt. of 





Wt. of 





Wt. of 







Arsenic 



air dry 



No. of 



air dry 



No. of 



air dry 



No. of 



Pot 



in soil 

 per cent. 



plants 

 gms. 



plants 



plants 

 gms. 



plants 



plants 

 gms. 



plants 



1 



.001 



14.5 



5 



23.5 



5 



73.0 



5 



2 



.005 



8.2 



5 



20.5 



5 



26.5 



5 



3 



.010 



6.0 



5 



19.5 



5 



69.5 



5 



4 



.015 



7.2 



5 



31.7 



5 



68.0 



5 



5 



.050 







16.5* 



5 



20.5* 



5 



6 



.100 















7 



.250 















8 



check 



10.0 



5 



25.0 



4 



64.2 



4 





Represents weight of 



second 



planting, 



the first having 



died. 



