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. 



ZE'TTIBIjIO-A-'riLOIISrS OF THE 



JOHNS HOPKINS UNIVERSITY 



BALTIMORE. 



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



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

 volume. 



II. American Chemical Journal. — I. Remsen, Editor. 8 Nos. yearly. 8vo. 



Volume XI in progress. $4 per volume. 



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



terly. 8vo. Volume X 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 VII in progress. $3 per volume. 



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



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

 $1 per year. 



VII. Annual Report. — Presented by the President to 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. 



Rowland's Photograph of the Normal Solar Spectrum. New edition now 



ready. $20 for set of ten plates, mounted. 

 Observations on the Embryology of Insects and Arachnids. By Adam 



T. Bruce. 46 pp. and 7 plates. $3.00, cloth. 

 Selected Morphological Monographs. W. K. Brooks, Editor. Vol. I. 370 



pp. and 51 plates. 4to. $7.50, cloth. 

 The Development and Propagation of the Oyster in Maryland. By W. 



K. Brooks. 193 pp. 4to ; 13 plates and 3 maps. $5.00, cloth. 

 On the Mechanical Equivalent of Heat. By H. A. Rowland. 127 pp. 



8vo. $1.50. 



A full list of publications will be sent on application. 



Communications in respect to exchanges and remittances may be 

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

 Maryland. 



