105 



ducing from ten to thirteen bolls, LinUthgow measure, 

 per Scotch acre. The only deficiency was in crop 1789, 

 which averaged but nine bolls />?; acre ; that might be 

 ascribed, however, to a season peculiarly unfavourable. 

 There is no evidence of diminished fertility in the field, 

 for it is now, (August iSic), covered with a luxuriant 

 crop of turnips. It is perfectly free from couch-grass, 

 and rooted perennial weeds, which are now in a great 

 measure extirpated by hoeing and weeding, but it is still 

 much infested with annual weeds, particularly the wild 

 mustard and radish, which may be imputed to the ne- 

 glect of the farmers in the neighbourhood, and to the use 

 of Edinburgh dung, stored with the seeds of these and 

 other injurious plants, which the richness of the soil 

 brings both speedily and universally to vegetate. Dr 

 Stuart adds, that the quantity of produce from the above 

 rotation has not diminished, but that both the wheat and 

 beans have at least degenerated in quality, and on this 

 account, though the result might not be thought unfa- 

 vourable by many, he would not adopt it, if he had a 

 larger space of land en his farm calculated for wheat. 



It is evident, that it is only in the richest loams, and 

 most fertile soils, that such a rotation is at all practicable. 



Ihree years Rotation. 



We shall next proceed to consider rotations of three 



r 

 crops. 



Mr Arbuthnot, whom Mr Arthur Young considers to 

 be the ablest farmer he ever knew in the course of his 

 long experience, practised, for nine years, a three course 

 system, viz. i. Beans ; z. Wheat ; 3. Clover, and 

 when he quitted the farm where that plan was adopted, 

 he was fully persuaded, that he could have continued 

 that rotation for many years longer. This, however, 

 was effected by means of London dung, which he Usui at 

 O 



