No. 4. Penn. State College. Agricultural Station, July, 1888. 
//, J. P. — Biology and its Place in a Liberal Education. From 
Cook, A. y;— The Silo and Silage. From the Author. 
rom Northwest Agricultural- 
Darapsky, L.—La. Lengua Araucana, Publicado en la Revista de 
Artes y Letras. From the Author. 
Derby, O. A. — Occurrence of Monazite as an Accessory Element in 
Rocks. Extract from Am. Journ. Science, Vol. xxxvii., Feb., 
1889. From the Author. 
JDollo, Louis.— Sur le Genre Euclastes. Extrait des Annales de la 
Societe Geologique du Nord, T. xv., p. 114, stance du 7 Mars, 
1888. 
Edivards, W. H. — Description of the Preparatory Stages of Arge 
galathea Linn, with Notes on Certain Satyrince. Extract from 
the Canadian Entomologist, Vol. xxi. From the Author. 
Farlow, IV. 6^.— Memoir of Asa Gray. Read before the National 
Academy, April 17, 1889. From the Author. 
Frederico, Leon. — La Lutte pour I'Existense Chez les Animaux 
Gooch, F. A. and Whitfield, J. ^.—Analyses of Waters of the Yellow- 
stone National Park. Bull, of the U. S. Geol. Survey. From 
Department of the Interior. 
LLay, O. P. — The Amphibians and Reptiles of Indiana. Extract from 
Ind. Agricult. Report, 1886. From the Author. 
Liector, James. — Reports of Geological Explorations During 1885. 
Bull, of Colonial Museum and Geological Survey of New Zea- 
land. From the Author. 
Henshaw, Henry Wetherbee.—\W\\o are the American Indians ? Re- 
print from the American Anthropologist. From the Author. 
Hobbs, W. H.—On the Petrographical Character of a Dike of Diabase 
in the Boston Basin. Bull, of Harvard Museum of Comparative 
Zoology. From Alexander Agassiz. 
Husted, M. C— Hay Fever : Its Treatment Physiologically and 
Pathologically Considered. Extract from Journ. of New York 
Microscopical Society. From the Author. 
Jackson, Robt. 7!— The Development of the Oyster with Remarks on 
Allied Genera. Extract from Proceedings of the Boston Society 
of Natural History. From the Author. 
