to be made of tbe unique and rare birds contained in tbe grand collection under their control, in order that I might represent 
them in this work. Aud I would always hold in grateful remembrance the kindly interest taken in this production by the 
late Mr. John Cassis, iu whose sudden and unexpected death this science has lost the services of one of her most distinguished 
followers, and who gave to the finishing of the plates iu this work all the benefits of his knowledge, acquired by the experience 
of many years. 
To George N. Lawrence, Esq., I woidd acknowledge my indebtedness incurred for the loan at various periods of several of the 
types of his species from his own collection, and who at all times was ready to afford me such aid as was iu his power. Also to 
Dr. Elliott Coves I am greatly obliged for several interesting accounts of the habits of various species observed by him in Arizona 
and elsewhere. 
Messrs. Bowen & Co., to whom was entrusted the production of the plates, have fully sustained their high reputation, and it is 
with much pleasure I acknowledge the skillful execution displayed by them. 
The heads, feet,, wings, &c., which adorn the Introduction, were drawn on wood, with the greatest care and accuracy, by Mr. 
Edwin Sheppard, of the Philadelphia Academy of Natural Sciences, aud were engraved by Mr. W. J. Linton, who, as is well known, 
occupies the highest rank in his profession, and whose abilities are everywhere acknowledged. It is unnecessary for me to call 
attention to the skill here exhibited by this artist, it needs but to be seen to be appreciated. 
The impressions are all India proofs, issued by the University Press, under the supervision of Mr. Linton. 
And now, in conclusion, the Author would especially remember those who, aiding him with their patronage, have more than any 
others contributed toward the completion of this, the most extensive of his ornithological works; and who, by continuing with him, 
throughout the years during which this publication has extended, have encouraged him to persevere in his labors, and rendered to him 
that assistance, without which no effort of this character could ever result successfully. 
Vote. — On account of Ms instructions not having been complied with, tlie Author was obliged at the last 
moment to remove the blocks of the engravings from the hands of the proprietors of the University Press. 
Messrs. D. Appleton <fc Co. loudly allowed them to ho printed at their establishment, and the manner in 
which it has been accomplished, the Author is happy to think, leaves nothing to be desired. 
