1v CONTENTS. 
NUMBER CXLVI, 
Page 
ARr. VIL «—Henry Draper)... ..-:--s--2--2-- 0s st ee ene e-- 89 
iit, Phila at the base he es Chemung Group in New ~ 
ey TS WALLAAMBy oi te ae ng ae eee = = 97 
or 
IX. — Geological Ohemistry of” Yellowstone National Park. 
Geyser Waters and Sema by H. Lerrmann; Rocks 
Of the Fark: by W. BRAM, 222002 S 606 ese 104 
X.—Hlectromagnetie Theory “A Light: General Equations 
f Mo nochromatic Light in — of every degree of 
ranspare het W. Gis | 
XI.—The Rainfall in Middletown, ionnectan from 1859 to 
1882; by H. D. A. Warp, eta. ys Es 
Ag 
XII.—Discoveries in Devonian. Crustacea ; Bt LARKE, 120 
XIU. —Photographing the Solar Corona without an  Yelttpne 
PIUGGINR oa Cae oo ee ues 126 
XIV.—Observations of the Transit of Venus, pe Alo at 
the Lick Observatory, California ; D. 
XV.—The Antenne of Melée; a F. ©. om lot een 137 
XVI,—Hypersthene-andesite ; by W. Cross,..-...---..--- 
XVII.—Method for determining the Collimation Constant 1 
a Transit Circle; by J. _ SCHAEBERLE 
SCIENTIFIC INTELLIGENCE, 
say repoaly lg Physics.—Metallic ee: Ninson: Atomic weight of Thorium, 
Niso —Kthy] peroxide, BERTHELOT: Catechol- -orthocarboxylic acid, Mim- 
LER, Ms inet on of Solar icy, SrEMENS: Conservation of Solar En- 
soba os he of the aieaed Unit of baer ae esate to absolute 
Approximate Photometric Measurements of Sun, 
eos, “Cloudy ‘Shy, "Blectric: and suber ral lights, W. THO oe N. 149.—Dr. 
Siemen’s Address to Me ah eb of Arts, 150.—Die tecaciowenicten und 
oo a chinen und die Boia Secundar-Batterien, etc., 
n G. GLA iors  entiae on the Distillation of Coal-Tar, G. Lunas, 151. 
_ Geology and Mineralogy. —Jointed Structure; W. J. McGup, 152. —The Climatic 
iid N. von Koxscnarow: Netot’ esi the Laboratory of the 
Taiversity of Virginia, 159.—Analyses of Danburite from Switzerland: Native 
Lead and Minium in Idaho, W. P. Bake: Topaz from Stonehaia Maine, 161. 
_ Botany and Zoology.—F¥ormic and ran ig he in Plants, E. BERGMANN, 161.— 
Conspectus Fiore: Europee, ©. F. : Flora Brasiliens nsis, KicHLER: Flora 
of British India, 162.— Distribution of Onesie life i in depth, T. Fucus, 163. 
Astronomy.—Parallax of Alpha es and of 61? Cygni, 165.—Orbit of the Comet 
‘of 1771, 166.—Celestial Charts, O. H. F. Math, oe ery ae 
Obituary.—Titus Coan, 168. 
