DETERIORATION OF ARABLE SOIL. 255 



0-96, whicli pretty nearly corresponds with the full 

 average. 



For spelt, the mean was 0-79 of the average ; for 

 barley, 0-88 ; for oats, 0*88 ; for peas, 0-67 ; for pota- 

 toes, on the other hand, 0-98 ; and for colewort and 

 turnips, 0-85. 



The statistical data collected in Prussia and Bavaria, 

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

 have not the slightest doubt that it would hold equally 

 true with France and other countries, England included. 

 The visible gradual deterioration of the arable soil 

 cannot but command the serious attention of all men 

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

 utmost importance that we do not deceive ourselves 

 respecting 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 oui' duty to 

 examine and appreciate the signs : if the source of the 

 e\il is once detected, the first step is thereby taken to 

 remove it for ever. 



