The system of irrigation has necessarily involved immense labor. For many miles the water is conducted from the mountains through dense forests, across ravines, round the steep sides of opposing hills, now leaping into a lower valley into a reservoir, from which it is again led through this arduous country until it at length reaches the land which it is destined to render fertile.

There has been a degree of engineering skill displayed in forming aqueducts through such formidable obstacles; the hills are lined out in every direction with these proofs of industry, and their winding course can be traced round the grassy sides of the steep mountains, while the paddy-fields are seen miles away in the valleys of Ouva stretched far beneath.

At least eight out of ten of these watercourses are dry, and the masonry required in the sudden angles of ravines, has, in most cases, fallen to decay. Even those water-courses still in existence are of the second class; small streams have been conducted from their original course, and these serve for the supply of the present population.

From the remains of deserted water-courses of the first class, it is evident that more than fifty times the volume of water was then required that is in use at present, and in the same ratio must have been the amount of population. In those days rivers were diverted from their natural channels; opposing hills were cut through, and the waters thus were led into another valley to join a stream flowing in, its natural bed, whose course, eventually obstructed by a dam, poured its accumulated waters into canals which branched to various localities. Not a river in those times flowed in vain. The hill-sides were terraced out in beautiful cultivation, which are now waving with wild vegetation and rank lemon grass. The remaining traces of stone walls point out the ancient boundaries far above the secluded valley now in cultivation.

The nation has vanished, and with it the industry and perseverance of the era.

We now arrive at the cause of the former importance of Newera Ellia, or the "Royal Plains."

It has been shown that the very existence of the population depended upon the supply of water, and that supply was obtained from the neighborhood of Newera Ellia. Therefore, a king in possession of Newera Ellia had the most complete command over his subjects; he could either give or withhold the supply of water at his pleasure, by allowing its free exit or by altering its course.

Thus, during rebellion, he could starve his people into submission, or lay waste the land in time of foreign invasion. I have seen in an impregnable position the traces of an ancient fort, evidently erected to defend the pass to the main water-course from the low country.

This gives us a faint clue to the probable cause of the disappearance of the nation.

In time of war or intestine commotion, the water may have been cut off from the low country, and the exterminating effects of famine may have laid the whole land desolate. It is, therefore, no longer a matter of astonishment that the present plain of Newera Ellia should have received its appellation of the "Royal Plain." In those days there was no very secure tenure to the throne, and by force alone could a king retain it. The more bloodthirsty and barbarous the tyrant, the more was he dreaded by the awe-stricken and trembling population. The power of such a weapon of annihilation as the command of the waters may be easily conceived as it invested a king with almost divine authority in the eyes of his subjects.