BY CARL E. GUTHE Cambridge, Mass. Published by the Museum 1921 COPYRIGHT, 1921 BY THE PEABODY MUSEUM OF AMERICAN ARCHAEOLOGY AND ETHNOLOGY, HARVARD UNIVERSITY...

The solution set forth in this paper formed a part of a thesis for the degree of Doctor of Philosophy, taken in Anthropology at Harvard University. Thanks are due Dr. A. M. Tozzer of Harvard University, and Mr. S. G. Morley of The Carnegie Institution of Washington, for the interest they have taken in my work and the valuable aid they have given. I must thank especially Professor R. W. Willson of the Astronomical Department of Harvard for the inestimable help and unfailing patience he has contri