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.] 



P-CTBLICATIONS OIF THE 



JOHNS HOPKINS UNIVERSITY. 



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



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

 volume. 



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



Volume VIII in progress. $3 per volume. 



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



terly. 8vo. Volume VII 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 III in progress. $5 per volume. 



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



Monthly. 8vo. Volume IV in progress. $3 per volume. 



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



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



DANA'S WORKS. 



Ivison, Blakeman, Taylor & Co., New York. — Manual of Geology, by J. D 

 Dana. Third Edition, 1880. 912 pp. 8 vo. $5.00. — Text-book of Geology 

 by the same. 4th ed. 1883. 412 pp. 12mo. $2.00. — The Geological Story 

 Briefly Told, by the same. 264 pp. 12mo. 1875. 



J. TViley & Sons, New York.— Treatise on Mineralogy, by J. D. Dana. 5th 

 edit, xlviii and 828 pp. 8vo., 1868. $10.00. The 5th " subedition " was 

 issued by Wiley & Son in April, 1874. (Each ''subedition" (or issue from the 

 stereotype plates), contains corrections of all errors discovered in the work up 

 to the date of its publication). Also, Appendix I, by G-. J. Brush, 1872. Ap- 

 pendix II, by E. S. Dana, 1875. — Manual of Mineralogy & Lithology, by 

 J. D. Dana. 3d edition. 474 pp. 12mo., 1878. — Text-book of Mineralogy, 

 by E. S. Dana. Revised edition. 512 pp. 8vo., 1883. — Text-book of 

 Elementary Mechanics, by E. S. Dana. 300 pp. with numerous cuts, 12mo., 

 1881. — Manual of Determinative Mineralogy, with an Introduction on 

 Blow-pipe Analysis, by George J. Brush. 8vo., 2d ed. 1877. Third 

 Appendix to Dana's Mineralogy, by E. S. Dana. 136 pp. 8vo. 1882. 



Dodd & Mead, New York. — Corals and Coral Islands, by J. D. Dana. 398 pp. 

 8vo, with 100 Illustrations and several maps. 2d ed., 1874. 



