The natives are unanimous in affirming that they were much more numerous in former times than they are now, and I am convinced that such was the case, for the following reasons. The old hill forts are many of them so large that an amount of labour must have been expended in trenching, terracing, and fencing them--and all without iron tools, which increased the difficulty a hundred-fold--that must have required a vastly greater population to accomplish than can be now found in the surrounding districts. These forts were also of such an extent that, taking into consideration the system of attack and defence used necessarily in those times, they would have been utterly untenable unless held by at least ten times the number of men the whole surrounding districts, for two or three days' journey, can produce. And yet, when we remember that in those times of constant war--being the two centuries preceding the arrival of the Europeans--the natives always, as a rule, slept in these hill forts with closed gates, bridges over trenches removed, and ladders of terraces drawn up, we must come to the conclusion that the inhabitants of the fort, though so numerous, were merely the population of the country in the close vicinity. Now from the top of one of these pointed, trenched, and terraced hills, I have counted twenty others, all of equally large dimensions, and all within a distance, in every direction, of fifteen to twenty miles; and native tradition affirms that each of these hills was the stronghold of a separate _hapu_ or clan, bearing its distinctive name. There is also the most unmistakable evidence that vast tracts of country, which have lain wild time out of mind, were once fully cultivated. The ditches for draining the land are still traceable, and large pits are to be seen in hundreds, on the tops of the dry hills, all over the northern part of the North Island, in which the _kumera_ were once stored; and these pits are, in the greatest number, found in the centre of great open tracts of uncultivated country, where a rat in the present day would hardly find subsistence. The old drains, and the peculiar growth of the timber, mark clearly the extent of these ancient cultivations. It is also very observable that large tracts of very inferior land have been in cultivation; which would lead to the inference that either the population was pretty nearly proportioned to the extent of available land, or that the tracts of inferior land were cultivated merely because they were not too far removed from the fort: for the shape of the hill, and its capability of defence and facility of fortification, was of more consequence than the fertility of the surrounding country.