proportions, becomes the all predominant type of structure. In the Lower Mississippi Valley, in some cases, as we have observed, dried brick were used in the walls and angles of pyramids of the most perfect type. Stone was also employed in a few instances. Here we find the transition to Southern Mexico complete. No break exists in the architectural chain. [Illustration: Stone Plates. ⅙ Natural Size. (Nat. Mus.) The left and central figures from an Alabama Mound.] Squier and Davis (and Foster as well as most other writers have followed their example) classified the works of the Mound-builders as follows: {_For Defence._ I. ENCLOSURES {_Sacred._ {_Miscellaneous._ {_Of Sacrifice._ II. MOUNDS {_For Temple-Sites._ {_Of Sepulture._ {_Of Observation._ To this some have added mounds for residence. It does not fall within the scope of this work to treat of the specific character and uses of the works of the Mound-builders, but rather to note their extent and indications of age with relation to their bearing on the antiquity of man in this country. Some of the arts and manufactures of the Mound-builders are set forth in the illustrations interspersed throughout the chapter.[65] A few of the cuts figure objects found upon the surface. Yet it is not improbable that a due proportion of these objects were of Mound-builder origin. The domestic arts appear the most advanced of any among this ancient people. Pottery of respectable quality and of varied patterns is abundant among their remains. Coarse cloth woven of vegetable fibre, and in some instances partly made of hair, has been discovered in mounds in several localities. Shell and copper beads for the purposes of ornamentation were made in great numbers. Copper axes of good quality have occasionally been exhumed. Copper and bone needles with well-drilled eyes were made by them. They wove baskets and coarse matting. They carved pipes in stone or moulded them in clay, sometimes in fantastic forms, while again they fashioned them with rare skill into the perfect effigies of animals and birds, or possibly ornamented them with likenesses of their own faces. With the exception of a few observations on the altar and sepulchral mounds, we refrain from a further treatment of the works above classified, as having no particular bearing on the question in hand, and refer the reader to the works of Squier and Davis, and also to that of Dr. Foster, already often quoted. Of the Altar or Sacrificial Mounds, the first-named authors remark: The general characteristics of this class of mounds are: 1. That they occur only within the vicinity of the enclosures or sacred places; 2. That they are stratified; 3. That they contain symmetrical altars of burned clay or stone, on which were deposited various remains which in all cases have been more or less subjected to