Vill CONTENTS. 
MSTOCK 26 
XLVIIL—The Number of Classes of Vertebrates and their 
Mutual Relations; by THroporE GitL,.-------------- 432 
1X.—Brief Contributions to Zodlogy, from the Museum of 
Yale College. No. XXV. Results of Recent Dredging 
Expeditions on the Ohass of New England. No. 3; by 
A. 
. V ERRILL, 435 
L.—Age of the Rocky Mountain Coal or Lignitic Formation, ta 
SCIENTIFIC INTELLIGENCE. 
Chemistry an cs.—On ocity of Sonu in Gases as a means of deter- 
mining ee sate Wolgnie. ect 0.—On the existence of Sulphurous 
Chloride, 451.—-On Sulphur joaetceesters Monae and SCHIFFERDECKER, 
452.—On the Moet of the Lactic acids, WISLICENUS, 453.—On the Synthesis 
of a new Propionic acid, sere .--On a new constituent of Urine, 
BavMSTARK: On the Passage of pers oe Colloid membranes of vegeta able 
origin, BARTHELEMY, 455.—Relation betw the atomic weight, the specific 
gravity and the hardness of the satelite lnce ata OTTONE: On a peri ity 0 of 
Cyclones and Rainfall in connection with the Sunspot periodicity, C. MELD 
457.—Secondary Currents and their ie eet GASTON PLANTE, 458. ne mat 
and Music: A non-mathematical Treatise on the Physical Constitution of Musical 
Sounds and Harmony, Eee: the chief acoustical discoveries of oo 
Sagrrgren “3 SEDLEY TAYLOR, 459. PO ages to = Pees of Mr. Moon; by 
R. J. Apco mistry; by C. L. BLOxHAM. 
Geology and Natwral History—Contributions from he Labor: fe of the Univer- 
sity of Pennsylvania. No.1. Corundun, its alterations and associated miner- 
als; F. A. Gent i 
0 
462.—United States Geological Survey of the Territories. F. V. HaypEn, Geol- 
i Synopsis of 
ogist in charge, 463.—S s of New Vertebrata from the Tertiary of Colo- 
rado, obtained durin e summer 13; by Precious opal 
from a new Mexican locality, 46 ements of the Glands of Drosera; by 
W.B Fl hing in Sarracenia, 467 : e 
Ss on 
Genus Yucca, 468.—On some remarkable forms of animal life from the Nor- 
bh ge Coast, partly from posthumous manuscripts 8 he late Professor Sars, 
Bidrag til Kundskaben om Norges Hydroider, 
Scientific Intelligence—On the ee of ee 1871, and on a 
of Locusts at Corb 471.—Remarks on the chemical anal yses of sam- 
ples of of soil from Bermuda, by J. H. Lerroy: avast of the Director of the New 
ete Observatory, for 1872: Gift of Mr. Ario Pardee to Science 
Rocky Mountain Observatory, James Lick, 473.—Palladium: Sulphur Product 
of the World, “ata. — Obituary.— August Breithaupt : G. C, Scheeffer, 474. 
ERRATA. 
Page 11, first note, after 1839, insert 1840, 1842. 
Page 26, in title, for H. A. Ouase, read A. W. — 
Page 170, 23d line from foot, for to LeConte, vad one to LeConte and one to Hunt. 
Page 172, top line, for LeConte, read Hunt. 
Page 265, 9th line ’ from foot, for eastern, read wi 
Vol. v, p. 435, 9th line from foot, for ten, read pore 
aoe 
