TABLE OF CONTENTS. xI 
PAGE 
Marble Beds of Vermont (October 17, 1870).................22.0005 62 
The Geological Position of the Remains of Elephant and Mastodon 
in North America (October 24, 1870)............0. ccc eee ee ees 7? 
On Recent Deep-Sea Dredgings (November 21, 1870)............... 106 
Titaniferous Iron Ores (April 24, 1871) ............. cee cece eee eee 223 
On the Gas Wells of Ohio and Pennsylvania (October 16, 1871)..... 266 
FREDERICK PRIME, JR. 
On the Metallurgy of Argentiferous Galenas (May 16, 1870)........ 25: 
PAUL SCHWEITZER. 
Notices of Recent Investigations Abroad in Chemistry (April 11, 
POS eave cree met eA Ter trates ie ecto nct ca ICat Get EL be 8 
On Kreosol and Phenol and their Homologues (December 12, 1870).. 137 
On the Action of Sulphurous Acid on Metals (February 13, 1871)... 165: 
Notes on the Felsites of the Palisade Range (June 5, 1871).......... 244 
CHARLES A. SEELY. 
On the Constitution of Ammonium-Amalgam (May 9, 1870)........ 16 
On Volatile Liquids Suitable for Ice-Machines (October 10, 1870)... 59 
Ontthe Colorsiof Metals (October 31,°1870)s2%/ 5 ass oe teens wcleletels 85 
E., GEORGE SQUIER. 
Alleged Discovery of the Arch among the Aboriginal Remains of 
INew “Mexico\(Novemberw/Si0) ie skenise oo te et neeeccet ne te 91 
W. STIMPSON. 
Notes on North American Crustacea in the Museum of the Smith- 
sonian Institution (October 2, 1871) (title)................ .2eeee 253 
ISIDOR WALZ. 
Notes on the Extinction and Reducing Power of Mercury (May 9, 
SO) Meta Netoistetccemisteteists)) eoruciekeisn lela e te fetetigntlis aiatelain) sis) <1sbietensre Wesiphaneehe 18 
AmtiincialsAlizarine) lune iG 1810) assay seteieetey« -alskelefa-/e1'e.<.aie\s/eersieley, ls 38 
On the Reduction of Sulphuric Acid by Zinc-Amalgam (December 
Pee) Seccinatdtetet tee seas yccrhsd sai cals nc). tuieig de cielo macs. aisiats sso 6 141 
HENRY WURTZ. 
A Preliminary Note on the Chemical Geogony of Silica (October 
HCD ics (A) eee we MD ce oer at Ua taraig sts 2 iuiavale eiata die eicip @nseya shegavin aie 56 
Progress of an Investigation of the Structure and Lithology of the 
Hudson River Palisades (November 14, 1870).........-....0000- 99 
Gas Wells (October 16,16 (ira s1icHs. SR WIE Re } ses ccetnie ln inet eeln es 260: 
