CONTENTS. Vv 
NUMBER CXLII 
Page. 
Arr. XV.—On the nature and duration of the discharge of 
a Leyden jar connected with an induction coil; by 
Cetin Tygon, oo Se we. ace 153 
XVI.—The Star-Mapper; by Henry M. Parxuurst,------ 163 
XVII— Additional remarks on the Nineteen-band Test-plate 
of Nopert; by cd. J. WUOrwany. os eee ek 169 
XVII.—On some remarkable relations and characters of the 
Western Boulder Drift ; by E. AnpREws, 172 
XIX.—Contributions from the Sheffield Laboratory of Yale 
College. No, XX.—On Durangite, a fluo-arsenate from 
Durango in Mexico; by Groree J. Brusu, 179 
XX.—Remarks on the Galvanic Battery; by G. W. Hoven, 182 
XXI.—Contributions of the Massachusetts Institute of Tech- 
nology. [.—On Nitric Acid and Chlorate of Potassium 
as an Oxydizing Mixture applicable to Sulphur, Sulphids, 
Chromium, Arsenic, Organic Matters, etc.; by Frank H. 
STORER, 190 
XXIL—On the Berg of Light on Uranium; by H. Car- 
riInaTON Boir 206 
XXUIL —Conteibiagipie to Chemistry from the Laboratory of 
_ the Lawrence Scientific School. No. 8.—On the action 
of the alkaline nitrites upon uric acid and its derivatives ; 
by Wotcorr Gisss, 215 
XXIV.—Account of the Swedish North Polar Expedition of 
1868, under the command of A. E. NorpENSKIOLD and 
Fr. W. VON OTTER 227 
XX V.—Contributions fron the Sheffield Laboratory of Tals 
College. No. XXI—On the Meteoric Stone which fell 
Dee. cine 1868, in Franklin Co., Alabama; by Gro. J. 
¢ 
—---- we 
Bru 
XXVL Deleon to Zodlogy from the Museum of Yale 
College. No. I.—Descriptions of some new American es 
Phyllopod Crustacea; by A. E. Vern, .---.-.._._- 944° 
VIL-—On the Lesleyite of Chester Co., Penn., and its re- : 
lations to the Ephesite of the Emery formation near 
Ephesus, Asia Minor; by J. Lawrence Soiru,___--- 
XX VIIL—On the Origin ‘at the Comets of 1812 and 1 
IV; by Prof. Dante, Krrxwoop 
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