As we have already said, another cause of emigration besides sheep-farming, though to some extent associated with it, was the raising of rents. Naturally enough, when the number of tenants upon a laird’s estate ceased to make him of importance and give him power, he sought by raising his rents to give himself the importance derived from a large income. There can be no doubt that, previous to this, farms were let far below their real value, and often at a merely nominal rent; and thus one of the greatest incitements to industry was wanting in the case of the Highland tenants, for when a man knows that his landlord will not trouble him about his rent, but would rather let him go scot-free than lose him, it is too much to expect of human nature in general that it will bestir itself to do what it feels there is no absolute necessity for. Thus habits of idleness were engendered in the Highlanders, and the land, for want of industrious cultivation, was allowed to run comparatively waste. That the thinning of the population gave those who remained a better chance of improving their condition, is testified to by many writers in the _Old Statistical Account_, and by other contemporary authorities, including even Dr Walker, who was no friend to emigration. He says,[72] “these measures in the management of property, and this emigration, were by no means unfriendly to the population of the country. The sub-tenants, who form the bulk of the people, were not only retained but raised in their situation, and rendered more useful and independent.” It is amusing now to read Dr Walker’s remarks on the consequences of emigration from the Highlands; had his fears been substantiated,--and had they been well grounded, they ought to have been by this time, for sheep-farming, rent-raising, depopulation, and emigration have been going on rapidly ever since his time--the Highlands must now have been “a waste howling wilderness.” “If the [Highlanders],” he says,[73] “are expelled, the Highlands never can be reclaimed or improved by any other set of men, but must remain a mere grazing-field for England and the South of Scotland. By this alteration, indeed, the present rents may, no doubt, be augmented, but they must become immediately stationary, without any prospect of further advancement, and will in time from obvious causes be liable to great diminution. All improvement of the country must cease when the people to improve it are gone. The soil must remain unsubdued for ever, and the progress of the Highlands must be finally stopt, while all the cultivated wastes of the kingdom are advancing in population and wealth.” How these predictions have been belied by facts, all who know anything of the progress of the Highlands during the present century must perceive. All these changes and even grievances have taken place, and yet the Highlands are far enough from anything approximating to depopulation or unproductiveness, and rents, we believe, have not yet ceased to rise.