CONTENTS. Vll
Number 293.
Page
James Dwight Dana. [With a portrait] (frontispiece) __ _ 329
Art. XXVIII. — Color Relations of Atoms, Ions and Mole- cules; byM. C. Lea. Parti. (With Plate IV.) 357
XXIX. — Further Notes on the Gold Ores of California ; by
H. W. Turner __ „._ 374
XXX. — Some Relations between Temperature, Pressure, and
Latent Heat of Vaporization; by C. E. Linebarger ... 380
XXXI. — Double Halides of Caesium, Rubidium, Sodium and
Lithium with Thallium ; by J. H. Pratt 397
XXXII. — Argon, Prout's Hypothesis, and the Periodic Law ;
byE. A. Hill . _. 405
XXXIII. — Improved Rock Cutter and Trimmer ; by E. Kid- well _ 417
XXXIV. — Relation of the plane of Jupiter's orbit to the mean-plane of four hundred and one minor planet orbits ; by H. A. Newton . _ 420
SCIENTIFIC INTELLIGENCE.
Chemistry and Physics — Presence of Argon and of Helium in Uraninite, Ram- sat and Crookes, 421. — Combination of Argon with Benzene vapor, Berthelot, 422. — Presence of Argon lines in the Spectrum of Atmospheric Air, Newall, 424. — Spark Spectrum of Argon as it appears in the Spark Spectrum of Air, Hartley, 425.
Geology — Reconnoissance of the Bahamas and of the elevated reefs of Cuba in the 'Steam Yacht "Wild Duck," 1893, A. Agassiz, 425.— Formation of Dolo- mite, C. Klement, 426. — Dolomite -making and dolomitic calcareous organisms, A. G-. Hogbom, 427. — Bahama Expedition of the State University of Iowa. Narrative and Preliminary Report, C. C. Nutting, 428.
Miscellaneous Scientific Intelligence — National Academy of Sciences, 428. — Penck's Morphologie der Erdoberflache, Penck, 429. — Orbit of Miss Mitchell's Comet, 1847, VI, H. A. Newton, 430.
Obituary — Dr. Gideon E. Moore: Prof. James E. Oliver: Francesco San- soni, 430.
