CONTENTS. 7 vy 
NUMBER CXXXV. ; 
Arr. XIV. a seg Correction of double Objectives; by C. 
S. Has 
XV.—To Cut a a ailment Sorew ; by C. Ku Waap 176. 
XVI.—Gold-bearing pied S the Province of Mivas Geraes, 
Brazil; by O. Ay Deiay. 2. a ee 178 
XVil.—The Flood of the Coninoshics: River Valley from the 
melting of the Quaternary Glacier; by J. D. Dana. 
WV 2 MCO RE, ies ces oo eC ewe a ee 179 
XVIII. —Geographical Distribution of certain Fresh-wate 
Mollusks of North America, and the probable causes of 
their Variation; by . Werne RBY, 203 
TX.—Description of a New Genus of the Order Eurypterida 
from the Utica Slate; by C. D. WatcormT, .......-...- 213 
X.—Notice of the remarkable Marine ee occupying 
- oa banks off ce eee coast of New England, 
No.4; be A; We Vea so es 216 
XXL =A new form of Ravers Stereoscope; by W. L. 
Pee eiees CLC sk een ey en ee RUN eee 226 
XXII. Magnets Properties of a Specimen of Nickeliferous 
Tron from es Catarina, nina ise a note by J. Law- pil 
a rence Smith; by H. Brecqurer PR Bea ONE AC 229 
XXUL. Origin of Jointed ola in undisturbed Clay ‘and 
Marl Pence by Ji De@ewra ee 233 
SCIENTIFIC INTELLIGENCE. 
Chemistry and Physics.—Relation between the Optical and Thermal phenomena 
of Liquid Organic substances, Brix, ant snd Dissociation Apparatus, 
TOMMAS!, 235.—Effect of ee on the Deco of Potassium Chlorate, © 
riadaol 0 Donatp: Freezi eee o = Sulphuric acid of different degrees of 
tion, ee 236. Ag tio Bismuthou vitae ts as ge 
e f 
ITLINGER and WACHTER: Le ga limit for “ihe ‘Kinetic Energy 0 
Electricity, pre 240.—Electrical Units recommended by the Blectrical 
Congress of 1881: Lessons in leoeioity and Magnetism, S. P. Thaonieoeia' Babies 
Meus Fos in Maine, G. H. Stone: Glacial inoue on, the 
5 G. F. Wrigut, 242.—Jura-Trias in C aoe R. C. Hiuts, 243 
Botany and Zoology. —Note on Graminez, G. BENTHAM: Flora Ben pe 
—Diagnoses Plantarum novarum Asiatica rat be z ong MOWICZ: 
possessed by Leaves of eae themselves a igies to the directions ne 
Thohlont Light, F. DARWIN. 245. —The Bota gece Nace Handbo ok, W. W. 
BAILEY, 246 yet Disealand Flora: A Memoir on the Ee asinine the 
retic Sea, {. Duxcan and W. P. sea Trg —Dis poNery of a fresh- . 
ptr shell (Getbacy in western New York. J. M. Cooke, 248. eas: 
Miscellaneous Scientific Intelli ligence.— Min Pan “ Bidiaheied: Bee. eae Ne Pe 
249.—Schott’s BTS bles ra sams i of the Predpitaton in Rain and Snow in 
vt nited States: Bosto Water, MSEN: The Lalande Astronomical 
; La Lumiére Piaeee Sek tae Moai 250. 
