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.] 
PUBLICATIONS OF THE 
JOHNS HOPKINS UNIVERSITY. 
I. American Journal of Mathematics. S. Newcoms, Editor, and T. Crate, 
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. 
Til. American Journal of Philology.—B. L. GILDERSLEEVE, Editor. Quar- 
terly. S8vo. Volume VII in progress. $3 per volume. 
IV. Studies from the Biological Laboratory.—Including the Chesapeake 
Zodlogical Laboratory. H.N. Martin, Editor, and W. K. Brooks, Asso- 
ciate Editor. 8vo. Volume II] in progress. $5 per volume. 
V. Studies in Historical and Political Science.—H. B. Apams, Editor. 
Monthly. 8vo. Volume IV iu 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, ete., 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. 8vo. $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. WiLzY & Sons, New York.—Treatise on Mineralogy, by J. D. Dana. 8th 
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, ]2mo., 
1881.—Manual of Determinative Mineralogy, with an Introduction on 
Blow-pipe Analysis, by Grorae J. BrusH. S8vo., 2d ed. 1877. Third 
Appendix to Dana’s Mineralogy, by E. S. Dana. 136 pp. 8vo. 1882. 
Dopp & Mgap, New York.—Corals and Coral Islands, by J.D. DANA. 398 pp- 
8yo, with 100 Illustrations and several maps. 2d ed., 1874. 
