Summary

Portrait of William Henry Holmes William Henry Holmes Ancient Pottery of the Mississippi Valley

To recognize these adventitious features, which are almost infinite in variety, would be to greatly embarrass form classification.
There is also another difficulty in the employment of form in classification—the nomenclature is very imperfect. We cannot use Greek names, as our forms correspond in a very few instances only with the highly developed forms known to classic art. Our own plain terms, although defective, are better and far more appropriate. All necessary correlations of form can readily be made when the comparative study of the pottery of the world is undertaken.
Source: Gutenberg

Portrait of William Henry Holmes William Henry Holmes Ancient Pottery of the Mississippi Valley

It is an interesting fact that with all this cleverness in the handling of clay, and in the delineation of varied models, the art had not freed itself from the parent stem—the vessel—and launched out into an independent field. In a few cases such an end seems to have been achieved by certain groups of mound builders, notably those whose works at Madisonville, Ohio, have recently been explored by Professor Putnam. Modeling in clay was probably confined to vessels for the reason that, through their humble agency, the art was developed.
Source: Gutenberg

Portrait of William Henry Holmes William Henry Holmes Ancient Pottery of the Mississippi Valley

The reasons for this, as well as for other peculiarities of the decorative art of the mound-builders as embodied in pottery, must be sought for in the antecedent and coëxistent arts of these tribes. These peoples were certainly not highly accomplished in the textile arts, nor had they felt the influence of advanced architecture such as that of Mexico. The influence of such arts inevitably gives rise to angular geometric figures. Taken as a whole, the remains of the mound-builders would seem to point to a hyperborean origin for both the people and their arts.
Source: Gutenberg

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