VI NORTH AMERICAN IJNGUISTICS. 
In the preparation of these sheets, I have placed myself under obli- 
gations in a greater or less degree to many persons, and it affords me 
pleasure to acknowledge these courtesies. Perhaps iu the greatest 
measure I am indebted to the Director of the Bureau, to whose sug- 
gestion the work owes its origin, and who throughout its progress has 
encouraged me by his advice and aided me by his criticism. Every 
facility at his command, personal and official, has been given me, and 
his private library and the Bureau records have been placed freely at 
my disposal. 
By Senor Don Joaquin Garcia Icazbalceta, of the City of Mexico, I 
have been treated with a generosity as complete as it is rare, and to 
this eminent bibliogiapher and his published works is due the credit for 
whatever of value is contained in these sbeets concerning the literature 
of Mexican languages. Besides correcting with his own i^en my copy 
of his "Apuntes para un Oatalogo," he has permitted me to make ex- 
tracts from the sheets, so far as printed, of his still unpublished "Bibli- 
ografia Mexicana del Siglo XVI," has furnished me with many new 
titles, has read and corrected my own proof-sheets, and has aided me 
in my work in every possible way. Such of his corrections as were re- 
ceived in time have been incorporated into the "Additions and Correc- 
tions"; the others will appear in the final sheets. It is a matter of 
regret that the whole of his last great work, the "Bibliografia," is not 
in type, that I might have availed myself still further of this admirable 
example of bibliographic art and research. 
In equal degree am I under obligations to Mr. Wilberforce Barnes, of 
New York City. Almost from the beginning of the type-setting the 
catalogue has had the benefit of his aid and advice. His thorough 
knowledge of the class of books treated, his interest in the subject it- 
self, his flue library, rich in bibliographic authorities, his scrupulous 
care and accuracy with the minutiae which compose so large a part of 
a work like this, and his judgment iu matters of arrangement, have all 
contributed to the improvement of these pages, and have combined to 
render his co-operation invaluable. The frequent mention of his name 
throughout shows but imperfectly the extent of my obligations to him. 
It has been impossible in every instance to acknowledge the many 
important facts communicated to me by Drs. D. G. Brinton, J. G. Shea, 
and J. H. Trumbull. These gentlemen, each of whom is an authority on 
the linguistic literature of this continent, have not only given me access 
to their richly laden library shelves, but have promptly and cordially 
responded to my oft-repeated inquiries. I have appealed to them, on 
numerous occasions, with perfect fieedom, and have invariably been 
treated with a cordiality calculated to awaken feelings of the profound- 
est gratitude; the final pages will show many changes suggested by 
them. 
To the Hon. John R. Bartlett, of Providence, through whose kindness 
I have a number of times been permitted to avail myself of the facilities 
