402 PKOCEEDING8 OF THE INDIANA ACADEMY OF SCIENCE. 



4. The rapid fi:rowtli and high yiehl of corn in oat boxes may be accounted 

 for partly by their high humus contents. 



5. There was an increase in acidity of the soil wherever the green ma- 

 nure was added, the acidity being less for the disced than the undisced. 

 The ch'ied manures showed no appreciable increase of acid. 



6. The high yield of corn in all limed boxes may be accounted for partly 

 by limestone neutralizing acidity produced and partly by the more favorable 

 condition for bacterial action and humus increase. 



7. RoUing under of green manures was more effective in com produc- 

 tion than either disking or drying. 



