9 
The following papers are now in press for our Bulletins three 
and four: “On Some Interactions of Organisms,” “The Food 
of Birds,” “The Food of Fishes,” “On the Food of Young Fishes,” 
“Notes on the Predaceous Beetles,” “Notes on the Food of the 
Carabide,“ anda “Catalogue of the Birds of Illinois.” All but 
the two last of these were prepared at the Laboratory by my- 
self. The paper on the “Food of the Carabide” was written by 
Mr. I’. M. Webster, of Waterman, and the list of Illinois birds by 
Robert Ridgway, formerly of Mt. Carmel, and now of the Smith- 
sonian Institution, at Washington. We have also in hand, for 
future publication, a descriptive list of the reptiles and batrachians 
of the State, by Messrs. Rice and Davis, of Kvanston; a paper on 
the leaf- mites, by my assistant, Mr. W. H. Garman; a “Key to the 
Genera of Illinois Carabidee,” and several shorter papers on miscel- 
laneous subjects. 
THE LIBRARY. 
No expenditure made by the Laboratory during the last two years 
has been so immediately profitable, both to the work of the estab- 
‘lishment and to the studies of other naturalists, as that made for 
mew books. While the additions are very few compared with the 
literature needed, they have cleared the field of difficulties which 
‘have blocked the progress of.our work for years, and have first 
‘made possible to the students of our local natural history, original 
(work of a satisfactory character, in a few departments of 
zoology and botany. While the books were purchased for the pur- 
‘pose of facilitating the work of the Laboratory. and are held  pri- 
marily for our own use, the library is open at all times to the 
public, and the books are likewise loaned to naturalists at a distance 
when not needed in the work of the institution. For the benefit of 
the students of natural science throughout the State, a classified 
‘ist of the principal works added during the last eighteen months 
‘is here inserted: 
RECENT ADDITIONS TO THE LIBRARY. 
Miscellaneous General Works. 
Zodlogical Record, Vols. I-XIYV. 
Proceedings of the Boston Society of Natural History, Vols. III- 
XIX. 
Journal of the Academy of Natural Sciences of Philadelphia (old 
series), Vols. I-VIII. 
Proceedings of fhe Academy of Natural Sciences of Philadelphia, 
Vols. XXVI-XXX, and parts 1 ‘and 2 of Vol. XXXI. 
Reports of the New York State Museum'of Natural History, 1855- 
1879. 
Proceedings of the United States National Museum, Vols. I and II. 
Bulletins of the United States National Museum, Vol. I. 
Bulletins of the United States Geological and Geographical Sur- 
‘yey of the Territories, Vol. 5, Nos. 1-4. 
Smithsonian Miscellaneous Collections, Vols. I-XVII. 
Proceedings of the American Association for the Advancement of 
Science, Vols. I-XXVI. 
