vi CONTENTS. 
NUMBER XVIL 
Page 
Arr. XXIX.—-Discovery of additional remains of Pterosauria, 
with. aes Sar of two new Species; by O. C. Marsn, 241 
XXX.—On a new method = en the Velocity of 
Rotation * A. E. Dor 248 
rer ae —Gre ountain Geckaanl On the Quartzite; by 
cs 12 Soe 
XX Xi1_—Deseriptons of two new Star-fishes, and a Cri- 
noid, from the Cincinnati group of Ohio and Indiana; 
by F. B. Mace, ES Syege a eee CE eae 257 
XXXIII.—Note on "Recurrent Vision; by C. A. You homage” 262 
XXXIV. 
1880.5: The 0 Awe ee se ec Suh 264 
XV. —Acoustical pana I? by Al M; Mave. 2.22 267 
XXXVI—Note on a Question of ‘Priority ; by E. Briuines, 270 
XXXVIL_ Ihe Aurora of Feb. 4, 1872; by A. C. Twintne, 273 
XXXVIII.—Brief Contributions to Zodlogy from the Mu- 
seum of Yale College. No. —Recent additions to 
the Molluscan Fauna of New England and the ge ear 
waters, with notes on other species ; ERRILL, 281 
P. E. Cua 
XLI.—The Yalan National Park; by F. V. Haypen, 294 
SCIENTIFIC INTELLIGENCE. 
Chemistry and Physics.—On the w: wave-lengths i gp em tots 8 ag tegen ER, 
ib Ce the spectroscopic observation of the rota of the sun, ZOLLNER 
OG i 
: nm the m 
—-On some new s of roseo-cobalt and luteo-cobalt, Krox, 300.—On the 
peg ohapees of pena into monatomic and hexatomic alcohols, BoucHAR- 
penis BERTHOUD : United States yiverbacer Surveys: Second Report of the 
of the Geological Survey of Wisconsin, MuRRISH : Annual Report it ‘the State 
of New Jersey for the year 1871: Das Elbthalgeb irge in Sachsen: Scheutz, 
Prodomus Monographize Georum, 306.—Baillon, Histoire des Plantes, 307. 
Astronomy.—On the Kclipse of the Sun on Sept. 29, 1875, Pain, 308.—Solar 
Relipse of Dee. 12, 310, 312.---Prof. To on the Eclipse —— 314. 
Miscellaneous Scientific Intelligence.—Correspondence relating to the Dismissal * 
the la tanist to the —— of eran 315; Hethcnt Analysis in 
stances, e 
unt’s Green Mountain Serie sag Obituary—D r. Wm. Baird, 319. 
W. H. P aan Canon Moseley: Adolph Seresker, 320, 
