CONTENTS. Vv 
NUMBER CXVIL. 
e 
Arr. XXII.—New Action of oe feng on a Permanent os 
Electric Current; by E. ALL 161 
XXIII.—Colors of Thin Blow wpipe Deposits ; by C. H. Koyr, 187 
XXIV. —Periodic Character of Voluntary Nervous Action ; 
y TAR MS Pore ee ae ee eo re - 189 
XXV.— — Geological Relations of the a Belts of West- 
chester County, New York; b s D. Dan 
XXVI—Permian and other Paleozoic calcein of the Kanab 
45 Arona? by GC.’ Di Wattooerr, 225 2 FL ees os 
XXVIL—Preliminar: y Account of a Speculative and Ane geal 
Search for a Trans-neptunian Planet DP, es 
XXVIII.—Notice of Jurassic Mammals representing ag 
New Orders; by O. C. Marsn,.. -..--.--- 
weer ee 
SCIENTIFIC INTELLIGENCE. 
Physics.—Terrestrial Magnetism, Stewart: Reversal of Photographic erste 
pt serene eesti aes Rotation of the Plane of Polarization of Light 
8, KunpT and RONTGEN 
os and Natural History. Se Re relations and fossil remains of the 
Arp Ree Tron ores of Picton, Nova Scotia. Dawson: DeCandolle’s Phytography, 
41.—Occurrence at Newport, R. I., of two littoral species of anid Shells 
iat ae recorded as Am si a : VERR RRILL, 250.—Rapid diffusion of Littorina 
the New Bngian nd Coast, VERRILL: Artificial hig ete of the 
Spanish Mac kerel, VERRILL ae es Ciona ocellata at Newport, R. I, 
VERRILL, 251 —Note = C. A. WuitE, 2 
Miscellaneous Scientific I —The American and British Associations: Deep- 
Sea Sounding and pete. aredim, 252. 
y.—Louis Francois de Pourtalés, 253.—Professor E. B. Andrews, 255.— 
Gener Albert J. Myer, 256. 
NUMBER CXVULI 
Art. X XIX.—-Mineral Locality at Branchville, Connecticut: 
one Paper. popoe nan and the results of its altera- 
; by G. J. Brusn and E. 8. Dana, (With aaa IV Oe 
XXX. —oaing Magnets; by R. B. Waxrper and W 
HIPL 
eee i, AA of the Cephalopod Siphon and Arms; 
V. K. Brooxs; Early Stages of some Polychzetous 
ponetaed: by E. B. Wr ILSON 3 “Rhythmical voles of 
the Process of Segmentation; by W. K. Brooks, -- - --- 288 
ie an tee and Embryological Dev sloede: 
BUR hid oa Ge. ppv ane ee ce co une 
XXXII ne Planetary Nebule; by E. C. PickERING, -- 303 
XXXIV.—Production and Reproduction of Sound apy Light; 
me. OC. Ba ee ee es ee 305 
