304 DATES OF PROFESSOR COPE’S RECENT PUBLICATIONS. 
publication. This agreement Dr. Leidy has scrupulously observed, 
and I have myself carefully kept it. : 
Between July 22d and October 8th, 1872, I published a series 
of fourteen papers on vertebrate fossils from the West, and in every 
instance mailed copies to Prof. Cope and Dr. Leidy on the day of 
publication, and, of the more important papers, a second copy by 
a subsequent mail, as we had also agreed. Believing, with most 
naturalists, that publication of a paper by means of advance cop- 
ies can be fairly done only by making these copies accessible to 
those working in the same department, I likewise sent copies of 
each of my papers, on the day gf publication, to the principal 
scientific centres in this country which are especially interested in 
this subject, namely: Professor Baird of the Smithsonian Institu- 
tion; the Museum of Comparative Zoology in Cambridge; the 
Boston Society of Natural History; the editors of the American 
Naturalist ; the editors of the American Journal of Science; the 
Academy of Natural Sciences in Philadelphia and the American 
Philosophical Society. I also promptly placed these pamphlets on 
sale at the Naturalists’ Agency in Salem, and sent early copies to 
paleontologists in Europe, and to various scientific journals. 
That these papers were duly received, the reeords of the above 
societies, and the reviews and notices in several periodicals, as 
well as letters from correspondents, afford ample testimony. The 
papers subsequently. appeared in successive numbers of the Amer- 
ican Journal of Science, from August to November, 1872.* 
During this period of over three months, in which these various 
papers were being published, I received nothing of the kind from 
Prof. Cope. An intimation from a friend finally led me to think 
that this author might, perhaps, have published something which 
had accidentally failed to reach me, and, as it was important to 
have this settled, I made inquiries at each of the above points in 
this country where I had sent my papers, and soon ascertained 
definitely, that no publications by Prof. Cope, issued subsequent 
to July Ist, 1872, had been received. The inquiry was diligently 
extended, also, among American naturalists, especially those who 
would be most likely to know of such publications, but no oe * 
_ dence of a single copy could be obtained. This was the case UP 
to October 8th, 1872, when the last paper of my geries was pub- 
_ lished, and I started for the West. | 
ans * Vol. IV, pp. 122, 202, 256, 298, 322, 323, 343, 344, 405 and 406. 
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