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 further growth thereof by converting, as we have seen elsewhere, for the purpose of defence, their marshy surroundings into water-sheets, through the construction of extensive causeways. While the remnants of the original 'teepantlalli' and of the 'tlatocatlalli' still remained visible in the gardens, represented to us as purely ornamental, which dotted the pueblo of Mexico, the substantial elements wherewith to fulfill a purpose for which they were no longer adequate had, in course of time, to be drawn from the mainland. But it was not feasible, from the nature of tribal condition, to extend thither by colonization. The soil was held there by other tribes, whom the Mexicans might well overpower and render tributary, but whom they could not incorporate, since the kinships composing these tribes could not be fused with their own. Outposts, however, were established on the shores, at the outlets of the dykes, at Tepeyacac on the north, at Iztapalapan, Mexicaltzinco, and at Huitzilopocheo to the south, but these were only military positions, and beyond them the territory proper of the Mexicans never extended. Tribute, therefore, had to furnish the means for sustaining their governmental requirements in the matter of food, and the tribute lands had to be distributed and divided, so as to correspond minutely to the details of their home organization For this reason we see, after the overthrow of the Tecpanecas, lands assigned apparently to the head war-chiefs, to the military chiefs of the quarters, 'from which to derive some revenue for their maintenance and that of their children These tracts were but 'official tracts,' and they were apart from those reserved for the special use of the kinships. The latter may have furnished that general tribute which, although