transcribing from the graphophone three of the songs rendered in this
book, and to Mrs. George S. Bixby for aid in transcribing the native
music. Finally I desire to express my appreciation of the untiring
services of my private secretary, Mrs. H. E. Hepner.

The upper illustration on page 65 is a reproduction of a photograph
kindly furnished me by Mr. Frank H. Chapman, and the illustration in
Vol. I., pages 145-146, is made from a photograph acquired through
the late Dr. P. Lamborn. The illustration in Vol. II., pages 464-465,
I owe to the courtesy of Mr. D. Gabriel Castaños, of Guadalajara.

The coloured illustrations are represented as the objects appear when
the colours have been brought out by the application of water.

The maps do not lay claim to an accuracy which, under the
circumstances, it was impossible to obtain, but they will, I hope,
be found to be an improvement on the existing ones.

Dr. Ales Hrdlicka, who has just returned from the Hyde expedition,
informs me that in visiting the western part of Sonora he found pure
Opata spoken west of Rio de Sonora and north of Ures, _e.g_., in Tuape.

Wherever dollars and cents are given Mexican currency is meant.

In the Indian Songs II., 10 and 18, I have made an attempt at rendering
the native words in English in such a form that the translations
could be sung, without, however, deviating from the original.

In the native words "x" should be given the sound of the Greek chi.