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that of Acolhua, in the wider sense, was adopted. From this point historical tradition has been so well reduced to order by Clavigero, whose work, translated into English, is still easily accessible, that I do not propose to give more than a mere summary of events. A list of the various "kings," together with approximate dates which I suggest after a careful comparison of many sources, is given in Appendix III. The principal point to be noted is the transfer of the political centre from Tenayocan to Tezcoco, which took place in the reign of Xolotl's third successor, Quinatzin, who removed his "court" thither; from this point dates what may be termed the "Acolhuan" domination of the Mexican valley. Meanwhile the Aztec had arrived, but being the latest of the migrants they were also the rudest, and were of little account. Even their prowess as fighters was counterbalanced by the comparative smallness of their numbers, and for years they lived under the protection of various rulers who employed their services in the wars which had already begun to break out between city and city. In the reign of Nopaltzin, Xolotl's successor, they are said to have been settled at Chapultepec, but, being oppressed by the chief of Xaltocan, they removed to securer, though less comfortable, quarters on the group of islands called Acocolco at the south end of the lake. Here they remained for half a century, until they were transferred to Colhuacan by the ruler of that city. By this time their numbers had increased, while their fighting qualities had not deteriorated, and after giving proof of the latter fact by defeating the Xochimilca, with whom the Colhua were at war, they felt their position sufficiently strong to insist on leaving Colhuacan for Mexicaltzingo. Here however they did not reside for long, but moved north first to Iztacalco and finally to Tenochtitlan. Even yet they were not strong enough to stand entirely by themselves, probably partly because they