The Wealth of Nations by Part 1 Chapter 11 Page 51

A greater share of this surplus, too, would belong to the landlord. Population would increase, and rents would rise much beyond what they are at present.

The land which is fit for potatoes is fit for almost every other useful vegetable. If they occupied the same proportion of cultivated land which corn does at present, they would regulate, in the same manner, the rent of the greater part of other cultivated land.

In some parts of Lancashire it is pretended, I have been told, that bread of oatmeal is a heartier food for labouring people than wheaten bread, and I have frequently heard the same doctrine held in Scotland. I am, however, somewhat doubtful of the truth of it. The common people in Scotland, who are fed with oatmeal, are in general neither so strong, nor so handsome as the same