vided the long lintels which distinguish this group of ruins. Where suitable stone was lacking, the deficiency was usually supplied by cement, and much use was made of the latter to correct irregularities in construction, though its employment appears to have been more frequent in Oaxaca and the Totonac region than elsewhere.
The art of pottery was highly developed amongst all the tribes hitherto mentioned, in spite of the facts that the use of the potter's wheel was unknown, and that the method of firing was very primitive. No kilns were constructed, but the pots were fired by means of wood fuel in the open air, perhaps in a hole in the ground. The quality of the potting varies considerably according to locality, but the finer examples, such as the ware from Cholula and the Totonac district, exhibit a very high standard of paste, form and technique, though the potters of this region of America cannot boast such consummate mastery over their material as the early inhabitants of the Peruvian coast. The fact, that in the later years prior to the conquest pottery had become an article of trade and tribute, led to a wide dispersal of local types from centres of manufacture which had acquired a reputation for skill in the art; and considerable borrowing of forms and ornament had resulted. At the same time, provided that the possibility of importation be not overlooked, the pottery remains afford much valuable evidence as to the interrelation of the tribes and the early history of the country. The coordination of this evidence is however only just at its commencement; careful excavations with due regard to the stratification of remains have been made at a few points in the valley, and the results have proved of such importance that similar researches throughout the whole of Mexico and Central America are most earnestly desired by all students of American archæology. In the valley of Mexico the local ware manufactured
