In April, 1911, Dr. Joseph E. Pogue, mineralogist in the US National Museum of Washington,
requested my co-operation in bringing out an extensive monograph which he contemplated
on the turquois from the mineralogical, historical, and ethnological points of view. It was
originally intended that the following notes should be embodied in the form of an appendix
in Dr. Pogue's proposed work which I understand is now complete in manuscript. As adverse
circumstances beyond the control of the author have unfortunately delayed for the last two …

An extensive collection of ancient clay figures gathered in the provinces of Shen-si and Ho-
nan during the period from 1908 to 1910 is the basis of the present investigation. As the
character of this material gives rise to research of manifold kinds, it has been thought
advisable to publish it in two separate parts. Many of the clay statuettes which form the
nucleus of our study are characterized by the wear of defensive armor, hence this first part is
devoted to an inquiry into the history of defensive armor,—a task of great interest, and one …