ONTENTS, 
Art. XXX VII.—Wave Length of the D, Helium Lie ‘Soa Pesach 
A. Dak? PAtMeEr, JR. owt ee 2 357 -| 
XXXVIIL —Additional Notes on Argon and Helium ; bys. a 
KA: (Hannes 2. el 
XX XIX.—Recent Browtaes in Optics; by W. LeContTe” — | § 
STEVENS. — Part I].....205.. 0. se 
XL.—Effect of the Mutual Replacement of Manganese and 
Iron on the Optical Properties of Lithiophilite and Tri- | 
phylite; by S. L. Penriztp and J. H. Prat 222 TACs aN 
XLL—Ammonium- -Cuprous Double Halogen Salts; by H.- 
L. Wetis:and EH. B. Hortetrt =: eee pee ES 
XLII.—Some Phonolitic Rocks from Montana; by L. V. 
PIRSSON 2 (20223 sc oe A ee Bobr 
XLIIE.—Reduction of Selenic Acid by Hydrochloric Acid; 
by F. A. Gooon and P. 8, Evans, JR..1. 2. eee 400 | 
XLIV.—Reduction of Selenic Acid by Potasstum Bromide 
in Acid Solution; by F. A. Goocu and W. 8. Scovitte 402 — 
XLV.—Reptilia of the Baptanodon Beds; by O. C. Marsu 405 
XLVI.—Restoration of Some European Dinosatrs, with 
Suggestions as to their Place among the Reptilia ; by | 
O. CG. Mansu. (With Plates V—V II1:)- 2-22 oo eeeeee 407 | 
see 
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Vie ML Pe ae a 
SCIENTIFIC INTELLIGENCE. 
Chemistry and Physics—Refractivity and viscosity of Argon and Helium, Lorp- ‘: 
RAYLEIGH: Compound nature of the gas from Cleveite, C. Runegr and. a 
PASCHEN, 413.—Specifie refraction of “Argon, 416.—Color Photography, O. 
WIENER, '417.—Electric Aureole: and Stratifications in the Electric are and in * 
discharges in rarified gases, LEHMANN: Magnetism of AsBestos, BLEEKRODE: 
Electric refraction of Liquids, P. DRUDE: Double refraction of electric waves — 
- in ice, V. BiERNACKI, 418.—Double refraction of electric waves, P. LEBEDEW, | | 
419. hay 
Geology and Mineralogy—Temperature Variation of the Thermal Condemns 
of Rocks, LorD KELYIN and J. R, E. Murray, 419. —United States Geological © 
Survey: 14th Annual Report for 1892-93, 423.—Gold fields of the Southern — 
Appalachians, G. F. BECKER: Columnar sandstone, J. M. CURRAN: Petrology | 
for Students, A. Harker, 425.—Introduction to the study of Rocks, L, | | 
FL&TCHER: Calaverite from Cripple Creek, Col., W. F. HILLEBRAND: Minerals | 
from New South Wales, A. LIVERSIDGE, 426,—Contribution to the Mineralogy | 
of Wisconsin, W. H. Hopss: Tabellarische Uebersicht der einfachen Formen | — 
der 32 krystallographischen Symmetriegruppen, Dr. EK. A. WuLFING: Mineral | 
Industry, its Statistics, Technology, and Trade in the United States and other — 
countries to the end of 1894: Field Columbian Museum, Handbook and Cata- Bs 
logue of the Meteorite Collection, O. C. FARRINGTON, 427, 
Botany--Synoptical Flora of North America, vol. I, A. Gray, S. WATSON, B. Le 
ROBINSON, 428.—Another example of Chalazogamy, Dr. S. NAWASCEIN, 429, 
Miscellaneous Scientific Intelligence—Meeting of the British Association, 429,- Sohal 
Origin of Thunderstorms, 430:—Uniformity of size of pages of Scientific Socie= 
ties Publications: Map of the wooded area of Connecticut: Erincipieey and 
Practice of Agricultural Analysis, H. W. Witzy, 431. 
Obituary—Professor CuaRLES V. RILEY, 432.—M. Lovis PASTEUR: Professor | 
EL. WHITNEY BLAKE: Dr. ALBERT HK. Foots, 434. ne le 
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At”? am 
ee Ten-Volume Index, Vols. XLI—-L, ready in January, price seven, five cents. lf 
