FURTHER TRIALS OF EXPLOSIVES IN THE GARDEN. 



plants having been identical. I think, therefore, that we may safely 

 conclude that the injections were the stimulating cause. 



Postscript. 



Since writing the above, the paper " On the Use of Charcoal as 

 Medium for Plant Growth" has appeared (R.H.S. Journal, xl. p. 473, 

 April 1915) : therein the possibility of some action being due to 

 oxygen absorption on the one hand and to the presence of creosote- 

 like bodies and potash does not appear to be discussed. The action is 

 probably complex, and probably some further investigation would be 

 of interest if not of importance. As a menstruum for applying some 

 of the less volatile soil fumigants it might have some value. All my 

 onion crop was charcoaled last year, but unfortunately no control patch 

 was left, so that whether the excellent way in which the onions have 

 kept in storage may have been due to this cause is uncertain. 



