BECKER BROTHERS, 

 No. 6 Murray Street, New York, 



Manufacturers of Balances and Weights of Precision for Chem- 

 ists, Assayers, Jewelers, Druggists, and in general for every use 

 where accuracy is required. 

 April, 1871.— [tf.] 



UPtTZBIilCA-TIOIlSrS OjF THE 



JOHNS HOPKINS UNIVERSITY. 



I. American Journal of Mathematics. S. Newcomb, Editor, and T. Craig, 



Associate Editor. Quarterly. 4to. Volume X in progress. $5 per 

 volume. 



II. American Chemical Journal. — I. Remsen, Editor. Bi-monthly. 8vo. 



Volume IX in progress. $3 per volume. 



III. American Journal of Philology. — B. L. Gildersleeve, Editor. Quar- 



terly. 8vo. Volume IX in progress. $3 per volume. 



IV. Studies from the Biological Laboratory. — Including the Chesapeake 



Zoological Laboratory. H. N. Martin, Editor, and W. K. Brooks, Asso- 

 ciate Editor. 8vo. Volume IV in progress. $5 per volume. 



V. Studies in Historical and Political Science. — H. B. Adams, Editor. 



Monthly. 8vo. Volume VI ready. $3 per volume. 



VI. Johns Hopkins University Circulars. — Containing reports of scientific 



and literary work in progress in Baltimore. 4to. Vol. VII in progress. 

 $1 per year. 



VII. Annual Report. — Presented to the President by the Board of Trustees, 

 reviewing the operations of the University during the past academic year. 



VII. Annual Register. — Giving the list of officers and students, and stating 

 the regulations, etc., of the University. Published at the close of the Aca- 

 demic year. 



Communications in respect to exchanges and remittances may be 

 sent to the Johns Hopkins University (Publication Agency), Baltimore, 

 Maryland. 



NEW CATALOGUES JUST PUBLISHED. 



Sent post free on Application. 



BIBLIOTHECA PALAEONTOLOGICA 



CONTAINING ABOUT 2000 WORKS AND PAMPHLETS. 



BIBLIOTHECA BOTANICA MICROSCOPICA 



Diatomese, Desmidieae, Characeae. 



CONTAINING OVER 300 WORKS AND PAMPHLETS. 



FELIX L. DAMES, 



Natural History and Scientific Bookseller. 

 2t 47 Taubenstrasse, Berlin, W. 



