CONTENTS OF VOLUME VI. 
NUMBER XXXL 
Page 
Art. I.—William 8. Sullivant: = Biographical Notice, .--.-. Be 
—On some results of the Earth’s Contraction Pin Sohag: 
Part IH, The Condition of oe Earth’s Interior, and the 
connection of the facts with Mountain-making; II, Met- 
morphism; by JamEs AM Aang bas iva, sc ee eye 
TIL. E Photography of Southern Star-Clusters; by C.S,Setiack, 15 
IV.—Meteoric Iron found near Shingle Springs, Eldorado orks: 
California; by B. Sirutmay, -- -------- eo 
V. —Contributions to Mineralogy ; ; by Asert R. Leeps, ---- 22 
Vi— n Mounds and relics on the © oe Oregon; by 
A. POnian 1 wicngy printed H. ma teen 
VIL—A local Thunder Storm; by Gror ay oe SRE ee: 32 
VII. The Diagonal cei in the Physical Faure of me 
igan; by A. Win SOR en oe! 
1X Notices of recent | Ractiianakes: “by C. G. “Rockwoo, Jr., 40 
X.—A convenient hi tae Micrometer for the Spectroscope ; 
by O. N. Roo 
XI.—Adam bedewis ck, 45 
XII.—Discovery of a new v Planet, (131); “by CHF. “Perens, 51 
pug en INTELLIGENCE. 
Chemistry and w Determination of the Leow ed of Light, CoRNuv, 52. 
— Activity of « Chiorive | ie i in the dark, MELSENS: Preparation of Chromic bipomeres 
D i ERTHELO deco’ 
JUNGFLEISCH, 54.—Synthesis of Try vosin, LapENBuURG: A Treatise on Electricity 
agnetism, JaMES C. MAXWELL, 55. Wohlers Outtinas of Organic Chem- 
istry, R. Firtie, 56. 
and Mineralogy —The Klamath River Mines, on ee — 
A. W. t 
Basin, JAME ormation” of the Rocky rig -vosna 
The Eozoon Can N. 60. phas Americana 
F. R. DirrenperFer: Report of the Geological Survey of Ohio, 62 —The ‘Coal 
Regions of America, JAMES MACFARLANE: Geologi p of the United States, 
ce rgia, D son: The S of the Ea nd Man, J. W. Daw- 
80N: Revue de Géolo DELESSE and DE LAPPARE Siliceous deposit of the 
gie, _ if . . + 
Upper Seige Neng of Firehole River r, F. M. EnpLicH, 66.—Mineralogie deila 
Toscana, A HIARDI: Aragotite, Metacinnabarite, F. E. DURAND, 6 
Zoblogy and Botany.—The Megalops stage of Ocypoda, S. I. Sirs, nt —Corals 
Coral Ian by J. D. Dana; reply to the criticism of P. Martin Duncan, 
—Principles o ? Axiunal Mechanics, SAMUEL HAvGHTOx, 14. ~"Check-list of the 
Poms of f North America north of Mexico, Jonny Roz = _ —— of 
~~ Martius, J Prof. E10nLER, 75.—A Monograph of bet 
Dodecatheon Meadia, 76.—E. Regel, iAoinaa versiones de Plantis vivis eommeta 
Hort. Bot. Imp. Petropolitani, 77. 
Astronomy.— yg ae ey and adudeonity pier’ gl spat during the year 
1870 at the g S. Naval Observato ra Australis, 7 
entific “tel gence —Earth ai wave of pee 14th, 1868, and 
the depth es the Pacific, J. E. Hme@arp, 77.—The Challenger Expedition: Mich- 
