CONTENTS. Vil 
NUMBER CXXXI. 
P 
Arr. XLV.—Jurassic Birds and their Allies; by O. C. Marsn 337 
XLVI.—The Rvaphcier de Aurora of September 12-13, 1881; 
Vv J, MY SOMARBBELS (26.000 Gece 220d. Gl ee 34] 
XLVII.—Address of Sir J op Lubboek’: -. J Tov. teaes 343 
XLVITI bis. —The Stereoscope, and Vision by Optic Diver- 
gence; by W. -L@OONTE STEVENS 2.2242 25..2.° 7 gee 
XLVIIL —The Electrical Resistance and the Coefficient of 
Expansion of Incandescent Platinum; by ICHOLS 363 
XLIX. erp Subsidence produced by an Tee-sheet s by W. 
LOCC Rea iL. CUR tee el ee eee 368 
i Rite on » onions Group of Southern New Mexico; 
SPACE gd gee 70 
LI. —Potariscopie Oheeecations of Comet ¢, 1881; by A. W. 
pA EAA Sette gira Giles a wha Geet Rag 372 
LIL _The “Relative Accuracy of different sa a of deter- 
mining the Solar Parallax; by W. Harxnuss ---.._.-- ee 
LUI.—The Nature of Cyathophycus ; by C. D. Wit corr .. 394 
SCIENTIFIC INTELLIGENCE. 
Chemistry and nibs seni Pca ei pip of Electricians, en wae 
and Motion, W. TxHo. : Efficiency o f Spectroscopes, Liperci H, 396.—Niagara 
alls source of inate, . THomson: Change of plane of rohan of 
Heat rays by Electro-magnetism, L. GRUNMAC H, 397. ~Hietro-dynamie Balance, 
ge wa peenie condition iron and steel by 
magnetization, V. StRovHAL and ©. Barus: -Principles of ee Philosophy, 
J. P. Cooke: A Manual of gute yeni J. H. TuoKnr, 3 
gy and Miner: neon and Resources of the Black Hills of Dakota, 
rag Saat and W. JENNEY, 399.— eke ke nee te or see eee of 
the Handiwork in baat soot and clay of ae e Race i Patines 
Atlantic Seaboard of Am CS Abe nM BW. orth on 
the Iron Ores of the Marcistte District, 402. ge aha and a” Che of the 
Marquette Region, M. oe mn acd 403. Peg nd sos mmals of the 
Lowest Eocene of New e Rodents of North America and Cani- 
de of the Loup Fork Bpodn: The Trish Elk, hei aceros Hidernius in the 
Ancient thar: heb ig of Ireland, W. yoo IAMS, 408.—Tertiary Lake Basin of 
Florissant, Col CUDDER, 409 Addr ress of the President of ie 
iety of London : Pantotheria » of ira Vanadates of Lead a 
the Castle Dome Mines in Arizona, W. P. 
Botany and Zoology.—Recent Papers on the Marine Invertebrata of the Atlantic 
Coast of eee rg snes - E. VerRIL1L, 411.—Ma) ae! of Practical aud Normal sy. 
Histology, T. RUDDEN, 414.— _ 8. Entomological Commission: The Hes- 
sian Fly, A. S. PACKA aie “i S. Morse on changes in ae and Lunatia, 415. 
Astronomy.—Theory of the Moon’s motion, deduced from the Law of Universal 
Gravitation, J. N. SrockweEwt, 415.—Astronomical and Meteorological Obser- 
_ Yations made during the year 1876 at the U. 8. Naval Observatory, 416. 
Obituary.—Dr. G. Linnarsson, 416. 
