THE PLAIN 'ENGLISH' OF IT. 185 



themselves, by the centrifugal motion they communi- 

 cate to the particles they have detached from the sub- 

 stance they act upon. A circular 'cultivator' steam- 

 driven will do the same. It docs so more effectually 

 according to the speed (of revolution) and the state of 

 the soil. This last incident is as it should be ; for it 

 is not desirable that a clay soil should be dealt with 

 when in an improper state for tillage ; and one great 

 advantage of such an instrument as I point to would 

 be that it would so immensely enlarge the choice of 

 a suitable period, by its compendious accomplishment 

 of the whole Avork of culture. 



My object, however, is not so much to advocate the 

 particular mode of applying Steam-power which I 

 myself suggest, as to explain the grounds on which I 

 feel more and more strongly assured that the attempt 

 to employ it through the medium of the plough must 

 be eventually renounced. 



"There's one thing," said Mr. Greening, who had 

 been listening throughout with unusual attention and 

 perseverance, and nodding knowingly at the end of 

 each sentence, as if the idea was steadily gaining 

 ground upon his mind, "There's one thing that 

 you have n't mentioned, and on your own side of the 

 matter, too. The finer the soil 's worked down, the 



