CONTENTS OF VOLUME XX. 
NUMBER CXYV. 
Page 
Art. L—Contributions to Meteorology; by Ex14s Loomis, 
(Wath Plates T, I), c2c. 1: 2. enzee 1 
IL—Geological Relations of the Limestone ‘Belts of West- 
. chester County, New York; by J. D. D cieceh ts OE 
‘vit 1T.—Observations on Mount Etna; by S. P. pee Teme 
v. hice of Certain RihorAinate Types of ee a 
Land Mollusca; by C. A. Wurrs,.....-...-...--- at 
Le <iaebeaees ion of a new Position Micrometer; by L. Watpo, 49 
VI. a. s Method for Determining the Velocity of an 
me Carrent ;. by MH. Taka, os 5. 5 aioe 52 
Vil = Menaralogical Notices ; by C. ota 54 
VIIL— —Improvement in the Sprengel Pump; by O.N. Roop, 57 
SCIENTIFIC INTELLIGENCE. 
Chemistry and Physics. —Carbonyl Bromide, EMMERLING, 58.—Hydrate Ma Bear 
dioxide, Scu6ne: Furfuran and Sylvan in Pine wood tar, ATTERBERG, 59.—Crys- 
tallized anhydrous Oxalic acid, VILLIERS: Continuous dis scksepemteo of ‘aig Ace- 
tate, Pagst, 60.—Alkaloids of Belladonna, Datura, Hyoscyamu te ek 
LADENBURG: Stet of Chinoline, KoENiGs, 61.—Two Com heen s formed 
ped Urea with Gold Chl aig: Heintz: Relation between the Velocity ‘of Light 
he Density o: of Bodies H. A. Lorentz, 62.—Aurora Borealis, W. DE LA RUE 
. W. MULLER, 63 
Geology and Mineralogy.—Geology of the High Roce of Utah, C. E. Dutton, 
63.—Pennayivanta Geological Survey, I. C. WuitE, 69.—Annu al Report of the 
Wisconsin Geological Survey for the ‘year 1879, T. C. Secor MBERLIN: Report on 
the Florida Reefs L. Agassiz: Early Man in Britain, and his place in the Ter- 
T. : 
Relief Geological Map of New Hampshire: Brief Notices of some recently 
described “ggg 72. ee. of the Hi esis Iron from Cleberne Co., 
Alabama, by J. B. MACKINTOSH, 
Botany and Zoology.— Action of Light on Vegetation, 74.—Criticism of the accounts 
of the Brains of the Lower Vertebrates given in Packard’s Zoology, by B. G. 
WILpER, 76 
Miscellaneous Scientific Intelligence —Centennial =e La poate Academy of —_ 
and Sciences, 78.—On the Recurrence of Solar s, 79.—Mult 
Division Table, L. WaLpo: Special Report of tas tee York State j erin ee T. 
GaRDNER, 80 
