It must not be imagined that, previous to the changes we are speaking of, there were no sheep in the Highlands; there were always a few of a very small native breed, but the staple stock of the Highland farmer was, as we previously mentioned, black cattle. The sheep, however, have also to a very large extent superseded them, a fact which is deplored by those who lament the many innovations which have been introduced since 1745. But by all accounts much of the country is unsuited to the pasturage of black cattle, and as cattle and sheep do not thrive well together, the only alternative seems to be the introduction of sheep alone into those districts unsuited for cattle. “More than one-third of the country consists of mountains and declivities too steep and abrupt for black cattle, and the grass they produce too short and fine to afford them a tolerable pasture except in the height of summer. The greater part of the pasture is therefore lost, though it might all be beneficially consumed with sheep. A flock of sheep will thrive where cows and oxen would starve, and will go at all seasons of the year to such heights as are inaccessible to black cattle.... In a situation of this kind the very wool of a flock would amount to more than the whole profit to be obtained by black cattle.”[70] The only conclusion to be drawn from these statements is, that the wisest thing that could be done was to introduce sheep into those districts which were being wasted on black cattle. Along with the introduction of sheep, indeed, to a great extent caused by that, was the enlargement of farms, which with the raising of rents led to the depopulation of many districts. The old system of letting farms in the Highlands has already been sufficiently explained, and the introduction of sheep seems to have rendered it necessary that this old system should be abolished, and that a large extent of country should be taken by one man. The question between large and small farms does not appear to us to be the same as between the old and new system of letting land. Under the old system, a farm of no great extent was often let to a large number of tenants, who frequently subdivided it still more, by either sub-letting part, or by sharing their respective portions with their newly-married sons and daughters. The testimony as to the perniciousness of this old system is universal; it was, and until recently continued to be, the chief source of all the misfortunes that have afflicted the Highlands. As to whether, however, this old system should have been entirely abolished, or whether some modification of it might not have been retained, has been a matter of dispute. Some maintain that the Highlands can be profitably managed only on the large farm system, and only thus can sheep be made to pay, while others assert that, though many districts are suitable for large farms, still there are others that might with great profit be divided into small holdings.