Of course, incomparably the most important mass of fresh evidence is that which has been brought together by Mr. Hall himself during his two years’ researches amid the central group of ruins, and is now permanently embodied in _Great Zimbabwe_. Yet the work has in a sense been but begun; it has reached down only to the ancient flooring which has still to be explored; and we are assured by Sir John Willoughby, a most competent authority, that after two months’ exploring the wonderful Elliptical Temple with a large gang of labourers, two years will yet be needed to complete the surface work of that structure alone, without touching the old floors. Mr. Hall infers that three further years will be required for the Acropolis itself, besides the “Valley of Ruins,” with the groups of buildings extending in all directions for over a mile from the temple. A mere glance at some of the finely reproduced photographs creates a sense of awe and amazement at the huge size and solidity of the containing walls with their patiently interwoven chevron and other patterns, and at the vast extent of the ground covered by these great monuments of a forgotten past. Their erection must have taken many scores of years, one might say centuries, and their builders must consequently have dwelt for many generations in the land which they so diligently exploited for its underground treasures. Here and in all the other strictly mining districts they carried on their operations in the midst of hostile native populations, as is sufficiently evident from the strongholds crowning so many strategical heights, from the formidable ramparts and the immense strength of the outer walls, everywhere rounding off in long narrow passages leading to the inner enclosures. [Illustration] Under such conditions it will naturally be asked, whence did the foreign intruders obtain their food supplies? The answer to this question is suggested in _The Ancient Ruins_, where it is pointed out (p. 208) that the auriferous reefs of the central Zimbabwe district, and generally of all the districts in immediate proximity to the fortified stations, show no traces of having ever been worked for the precious metal. “Possibly the reason for the ancients ignoring the gold-reefs of this district [Zimbabwe] lies in the fact that the country round about is exceedingly well suited for agricultural purposes, the soil being rich and water plentiful, and all vegetable growths prolific and profuse. The large population of ancients, together with the enormous gangs of slaves, would naturally consume a vast quantity of grain, and this necessity would create a large agricultural class, who, for their own safety and for the protection of their crops and fruits, would naturally carry on their operations within such an area as could be safeguarded by the fortresses of Zimbabwe.”