| Transcriber's note: | A few typographical errors have been corrected. Theyare listed at the end of the text, after the plates. |
When I decided to read a paper before the Ornithological Congress of 1905 on Extinct and Vanishing Birds, I found it necessary to illustrate my paper by a number of drawings. These drawings roused special interest among those who listened to my lecture, and I was asked by many if I could not see my way to publish the lecture and drawings, in book form, as these plates were far too numerous for the proceedings of the Congress. After some hesitation I determined to do this, greatly owing to the persuasion of the late Dr. Paul Leverkühn. The preparation of a book required considerably more research than the lecture, and therefore my readers will find, in the following pages, a totally different account to that in the lecture, as well as corrections and numerous additions. The lecture itself has been published in the "Proceedings of the IVth International Ornithological Congress."
I wish to thank very heartily all those of my ornithological friends, who have kindly helped me with the loan of specimens or otherwise, and especially Dr. H. O. Forbes, Dr. Scharff, Professor Dr. K. Lampert, Dr. O. Finsch, Professor Dr. A. Koenig, Dr. Kerbert, Mr. Fleming, Dr. von Lorenz, and others.
WALTER ROTHSCHILD.
The study of the forms of life no longer existing on the earth, from the scanty remains preserved to us, has provoked a very great interest almost from the commencement of historical times. The very small portion of this vast field I am treating of in the following pages has a special attraction, as it deals to a great extent with forms familiar in a living state to our immediate forefathers and even to some of ourselves. Although I have here arranged the species systematically, they fall into two distinct categories, namely those known externally as well as internally, and those of which we know bones and egg-shells only. Under the former category might be included those merely known from descriptions or figures in ancient books, as well as those of which specimens exist. In the present work several plates have been reconstructed from such descriptions in order to give some idea of their probable appearance. There is considerable difference of opinion as to the approximate date of the disappearance of many of the species known from bones dug from deposits which have been variously determined as pleistocene and post-pleistocene. It seems to me that this problem can never be entirely solved, but the significant fact remains, that while many bon