42 EXPERIMENT STATION. [Jan. 



years in the soil without serious deterioration, and if this treat- 

 ment would succeed in doubling or trebling the usefulness of 

 drain tile, it would be well worth while to employ it. 



There is also the possibility of killing roots in tile by treat- 

 ment with chemicals or gases, but little or no attention has been 

 given to this phase of the subject. 



Further experiments are being made ahmg this lino, and in 

 the mean time it is hoped that more extensive and practical tests 

 can be arranged. 



