vi PREFACE. 
as to the art sequence at Copan, for a number of statements written ex- 
pressly for insertion here, analyzing the stylistic features of different monu- 
ments, and more largely for his fundamental contributions to the whole 
field of Maya Art, which have so greatly stimulated research in the cognate 
branch of Maya chronology, by making possible the approximate dating of 
partially destroyed texts by means of the stylistic criteria present. 
To Mr. William Gates thanks are due for the free use of his large col- 
lection of post-conquest Maya manuscripts and books, which in size as well 
as in importance has no equal; for permission to reproduce the full text of 
the original Galindo report on Copan, now published for the first time 
(Appendix XI); for several translations both from Spanish and Maya into 
English, notably Appendix V, and the important page 66 from the Chronicle 
of Oxkutzcab (Appendix II); and especially for his observations on the dis- 
tribution of the Maya linguistic stock (Appendix XII) and for his preparation 
of the Index. 
To Dr. Guthe appreciation should be expressed for his painstaking care 
in the verification of the many calculations and bibliographical references 
throughout this work, and for other assistance in its final stages. 
To the officials of the Peabody Museum of Harvard University, Mr. 
C. C. Willoughby, Director, and Dr. A. M. Tozzer, Curator of Middle Ameri- 
can Archeology and Ethnology, the writer finds himself greatly indebted 
for their generosity in placing at his disposition all the material in the 
Museum relating to Copan, and to Mr. S. J. Guernsey also of the Museum 
staff for his assistance in utilizing the same. Indeed no exhaustive study 
of the Copan inscriptions could have been completed without recourse to 
the rich collections in the Peabody Museum, not only of original sculptures 
and casts, but also of hundreds of early unpublished photographs, and 
the writer wishes to acknowledge the consideration which has made possible 
the inclusion here of this important new material. 
Dr. Fred. E. Wright, of the Geophysical Laboratory of the Carnegie 
Institution of Washington, has kindly prepared a petrographic description 
of the material of the Copan monuments (Appendix I). 
Dr. W. H. Holmes, Head Curator of Anthropology at the United States 
National Museum, has graciously contributed one of his well-known archzo- 
logical panoramas, the drawing of Copan which forms the frontispiece of 
this volume; and Mr. John L. Ridgway, of the United States Geological 
Survey, has assisted greatly in preparing the illustrations for reproduction. 
Dr. E. L. Hewett and the Managing Committee of the School of Ameri- 
can Research have generously permitted the incorporation in this volume 
of the results of the writer’s first two visits to Copan in 1910 and 1912, which 
were made under the auspices of that organization. 
For assistance in special phases of this investigation thanks are due to 
Messrs. G. N. Collins, O. F. Cook, W. Popenoe, and Major E. A. Goldman of 
the United States Department of Agriculture, Dr. Ellsworth Huntington of 
