lv CONTENTS. 
Geology and Natural History —Geology of British Columbia, G. M. Dawson, 75.— 
ibbea 
Car n Miocene path Geological Survey of New Jersey. ml 1880, 77.— 
Heulopical Surv vey of P reat rane ngs rey of the Oil Regions of Warren, | 
Venango, Clarion and Bu tler Cou by J. F. CARLL: °'Statistics = | 
ee of fadlatia for 1880: p eectlauat a ties Earth’s Surface, N. 8. SH4 | 
ent: vis, 78.—The Trilobite, C. D. Watcorr, 79.—Ge ological Sutra 
of ite E. A. Sira: Felsites and their associated rocks north of Boston, 
J.8. Daaan: —— sur oi tags sp aitoes d’Altération des Dépots superficiels, 
fi. VAN DEN Bre Application of ‘a solution of mercuric potassium iodide in 
mineralogical ae lithological rset tions, V. Gotpscumipt, 80.—Deer horns — 
impregnate with tin ore, J. H. Contins, 81.—Microlite from a eape County, 
Virginia os pneiia. | Widerneds the food of some young fishes, 82. 
Astronomy.—Figures of the planets, 82.—Observations of the Transit of Venu 
“2 cays OMB: "Observation of Double Stars made at the U. S. Naval Obectea 
ry, A. Hab 
kon: ‘Selif ge ah a pgaons Sketch of the Boston Society of ; 
Natural History, T. T. Bouvé, 85.—American Association at Cincinnati: On | 
the so-called Cosmical Dae i pene 86. 
NUMBER CXXVIII. : 2 
Arr. XV.—Modification of Wheatstone’s Microphone and its 
ches; by A.G. 
with a modified form of eae es ; by OLN. oop, 90 
Gort stadt Series; by J. "D. Dist 103 
XX, sorted Meteoric Tron, of unknown locality, i in the Smith- 
nian Museum; by C. U. Suepar, . 119" 
XXI—_The relative motion of ip oats and of the Luminif: 5 
erous Ether; by A. A. Micu . 1200 
XIL.—Observations on the Light of + elescopes used as : 
Night-Glasses ; by Epwarp $8. Hoxpen, --.. -- eo 
-XXIIL—Nature of Dictyophyto P. Wurrrierp, .. 132 
by R. 
ek ae ee of the Soeeian of the Comet of June, 4 
; by Henry Drarer,. -o.- 19% 
XY. — Stason 0 Observations upon ‘the Comet b, 1881; 
XXVL —Observations of Comet , 1881, “made at the United 
States Naval Observatory ; by Wa. Harkness, --. 18 
XX VII—Observations on the Comet 1881 6; by Lewis Boss, 140 
og prea aetiga of Light from Comet b, 1881 ; 3 by A 
RI ES SISA ASO cals ange biota aut nce ce SNe ee ea 
142. | 
SCIENTIFIC INTELLIGENCE. 
Chemistry and Physics.—Ozone as a cause of the Luminosity of hago | 
CHAPPUIS: Appearance of Nitrous Acid during wo Eva aporation of Water 
W ARINGTON, 145.—Boron hydride, Jonus and TAaYLo St ha 0 gt Carbon 
Siadenina “ALDARY : : Hlectric Absorption = cat & {. A. Rownanp and 
E. H. N ia smission a radiation of low re emuapeoead throwgh 
peg ABNEY and Fx NG: Conservation a Klectricity, Lippma ing - 
of Ice, WULLNER ay ee weight of Uadintiinn Bivierieaton, 
