The Wealth of Nations by Part 1 Chapter 11 Page 225

much labour and be too expensive. If the price of cattle, therefore, is not sufficient to pay for the produce of improved and cultivated land, when they are allowed to pasture it, that price will be still less sufficient to pay for that produce when it must be collected with a good deal of additional labour, and brought into the stable to them.

In these circumstances, therefore, no more cattle can, with profit, be fed in the stable than what are necessary for tillage. But these can never afford manure enough for keeping constantly in good condition all the lands which they are capable of cultivating. What they afford being insufficient for the whole farm will naturally be reserved for the lands to which it can be most advantageously or conveniently applied; the most fertile, or those, perhaps, in the neighbourhood of the