244 THE SYSTEM OF FARM-YARD MANURING. 



ria, which are most reliable, give the same result ; and 

 I have not the slightest doubt that it would hold equally 

 true with France arid other countries, England includ- 

 ed. The visible gradual deterioration of the arable soil 

 cannot but command the serious attention of all men 

 who take an interest in the public welfare. It is of the 

 utmost importance that we do not deceive ourselves re- 

 specting the danger, indicated by these signs, as threat- 

 ening the future of the populations. An impending 

 evil is not evaded by denying its existence or shutting 

 our eyes to the signs of its approach. It is our duty to 

 examine and appreciate the signs : if the source of the 

 evil is once detected, the first step is thereby taken to 

 remove it for ever. 



