iv CONTENTS. 
NUMBER CXXIL. 
Page 
ART. ir —Julius Thomsen’s Thermochemical roe boa 
the Molecular Structure of the Hydrocarbon Com 
paraiae® OO 0. PO 0GGm ek one = 87 
IX.—Determination of the Force a Gravity _ the Summit 
of Fujiyama, Japan; by T. ENDENHALL,...- ..---- 9 
ears on Alaska and the Sy of Porae Strait; by 
W. H. Dati; with Plate V (a map, not num mber ed),---- 104 
XI—Relation of Devonian Insects to later and existing 
types; by 8S. H. ScuppER 111 
XIL —Meteoric Iron of Lexington Co., ,8.C.; - byC. U. Suepa ARD, 117 
XII.—Date of the Glacial era in Eastern North America ; 
vO. DW Reet, 09 ooo ie i ee ced 1 
XTV.—A Remarkable nugget of Platinum; by P. Cotiier, 123 
XV.—A New genus and species of: Air-breathing Mollus k 
from eke Coal-measures of Ohio; by R. P. WHITFIELD,- 125 
XVI.—Hiddenite, a variety of Spodumene; by J. L. a 128 
X VIL.—Remarks on the Genus Obolella ; by 8. W. Forp,.- 131 
XVITL—The ce chy Grit in England and Ti von 
ty ee CO et is cee 13 
XIX.—Principal Characters of American Jurassic Dinosaurs ; 
by O. C. Marsn; Part IV; with Plates VI, VII, Vill, 167 
SCIENTIFIC INTELLIGENCE. 
Chemistry and Physics. oy ww da Process pag preparing potassium iodide from 
Seaweed, ALLARY and PeLiieux: Volumes of certain Elements at their Boiling 
Points, RAMSAY and Ma 136 AS one Sulphides, Kay ocarbons 
0. Petroleum, Bers and KurBATOW, 137 in, Krtant, 138 
—Sace Saccharinie Acid, ScuErBLER: Synthesis of Tropic Acid, LADEN- 
BURG and ER: Experimental Researches upon the magnetic rotatory 
olarization s, BECQUEREL, —In of G nd Steam upon 
the Optical properties of — 8 Treatise on Electricity 
and a. Gorpon, 140.—Space protec a Lightning Conductor. 
W. H. Preece, 141. Ee ouseal and p Lina eee on the Manufacture of 
Sulphuric Acid and Alkali, G. Lunes, 44. 
Geology and Natural History.—Lava-fields of Northwestern Europe, A. GEIKIE, 
145.—Volumes of solid and liquid Cast Iron, J. B. Hannay, 147.—Climate of 
iberia i aL 
Siberia in the E e , H. H. Howorts, 148 ce Chan 
of later Geologi EY, 149 —Six ures 0 ical Geog- 
raphy, 8. Havueuron, 150.—Address by H. C. Sorby, President of the Geolog- 
ical Society of London, 152.—Geological Survey of Pen pe i vania, 153.—Qua- 
ternary after the Era of a cavenanials in Europe, M. Tarpy: River Channels 
filled with basalt, J. J. STEVENSON, 155.—Occurrence of "Provius longicaudus 
oo h ‘ é = WILLIAMS, 186. irom ae Sahara, RoLLAND: Arctic Coal: Clai- 
oup and its pierces pecan Paleontology of Austria-Hungary: A 
yeclined Mineral made from bricks, J. E. ReEyNoLps, 157,—Fossil Sponge- 
spicules from a clay bed near Sig, ap tones H. J. Carter: Glaciation of the 
sland : 
discoveries in Alexander Co, N. Care lina, W. E. Hippen, 159.—Jarosite from 
Arizona, 8. E. Paxeinin: Jarosite from Colora do, G. A. Kénta@: Octahedrite from 
Burke Co., N. Carolina, W. E. sts 160.—Urano-thorite, P. CoLLIER: Min- 
eralojia por I. DomeyKo: Las Especies Minerales de la oder — 
oe D. L. BRACKEBUSCH, 161.—Zoology for Colleges, 
_ Astronomy.—Figure of the Planet Mars, HENNESSY, 162. 
_ Miscellaneous Scientific In ce,—Ocean tem mperatures in the Arctic, 0. T. SHE 
cvgoe 163 walernrestcorbriom Tepoaitide of Electricity, 164.—History of the Jetties 
the Mouth of the Mississippi, CoRTHELL, 165.— Obituary.—-M. Chasles, 169. 
