Nature, i} 
June 3, 1907 
Index Vv 
Arnold (Prof. J. O.), the Internal Architecture of Metals, 
Lecture at Royal Institution, 43 
Arnold (R.), the Tertiary and Quaternary Pectens of Cali- 
fornia, 184 . 
Arnoux (G.), Arithmétique graphique, 
V’Etude des Fonctions Arithmétiques, 319 
Arrivaut (G.), the Pure Alloys of Tungsten and Man- 
ganese, and the Preparation of Tungsten, 24; New 
Modes of Formation and Preparation of Titanium 
Tetrachloride, 479 
d’Arsonval (M.), Distillation and Desiccation in a Vacuum 
with the Aid of Low Temperatures, 23 
Artillery and Explosives, the Development of Modern, Sir 
Andrew Noble, Bart., K.C.B., F.R.S., 174 
Ashe (W. W.), the Southern Appalachian Forests, 184 
Ashford (C. E.), the Veaching of Elementary Mechanics, 
Introduction a 
317 
Ashley (G. H.), Geology and Mineral Resources of Part 
of the Cumberland Gap Coalfield, Kentucky, 184 
Ashworth (James), the Coal-dust Problem, 496 
Ashworth (J. R.), Heat, Light, and Sound: an Intro- 
ductory Course of Practical Exercises, 436 
Asiatic Society of Bengal, 191, 240, 504, 511 
Asteroids, Recently Discovered, J. Bauschinger, 469 
Aston (W.), Experiments on the Lengths of the Kathode 
Dark Space with Varying Current Densities and Pres- 
sures in Different Gases, 574 
Astronomy: Astronomischer Jahresbericht, A. Berberich, 
6; the Position of Agathocles during the Eclipse of 
Bc. 310, August 15, P. H. Cowell, F.R.S., 10; Our 
Astronomical Column, 16, 40, 63, 85, 111, 137, 159, 182, 
208, 231, 257, 281, 304, 326, 350, 378, 402, 424, 447, 
469, 497, 518, 544, 569, 593, 615; Astronomical Occur- 
rences in November, 16; in December, 111; in January, 
208; in February, 350; in March, 424; in. April, 
518; Greenwich Observatory and the Power Station, 16; 
Lunar Changes, Prof. W. H. Pickering, 16; Eclipse 
Observations, Prof. Riccé, 16; Russian Observations of 
the Solar Eclipse, August 30, 1905, Chas. P. Butler, 163 ; 
Micrometer Measures during the Solar Eclipse of August, 
1905, J. Merlin, 350; the Solar Eclipse of Next January, 
111; Eclipse of the Sun on January 14 seen in Central 
Asia, 278; the Recent Total Eclipse of the Sun, Prof. 
R. Schorr, 326; the French Eclipse Expedition, 378; the 
Recent Solar Eclipse in India, 402; the Solar Eclipse of 
January 13, 544; Observation of Total Solar Eclipses, 
M. le Comte A. de la Baume Pluvinel, 257; the Zodiacal 
Light, Prof. Barnard, 16; the Mira Maximum of 1906, 
Prof. Nijland, 17; the Calorific Emission of the Sun, G. 
Millochau and C. Féry, 23, 96; the Calorific Radiation of 
the Sun, MM. Millochau and Féry, 40; the Leonid 
Meteors, John R. Henry, 30; a Bright Meteor, Mr. 
Rolston, 86; Observations of the August Meteors, Prof. 
von Konkoly, 182; the January Meteors, W. F. Denning, 
199; a Brilliant Meteor, H. E. Wood, 208; February 
and March Meteors, W. F. Denning, 342; Heights of 
Meteors Observed in 1906, Mr. Denning, 350; the Lyrid 
Meteors, John R. Henry, 560; the System of 61 Cygni, 
Prof. Barnard, 40; the Cape Observatory, Sir David 
Gill, 40; Minor Planets, Dr. Bauschinger, 40; Design- 
ations of Newly-discovered Variable Stars, 41; the 
Bologna Observatory, Prof. Rajna, 41; Discovery of a 
New Comet, 63; the Telluric Lines in the Solar Spec- 
trum, M. Stefanik, 64; the Helium Line, D,, in the 
Solar Spectrum, Mr. Buss, 281; Variation of Wave- 
lengths in the Solar Spectrum, Dr. Halm, 304; Photo- 
graphy of the Infra-red Solar Spectrum, G. Millochau, 
599; the Number of the Visible Stars, Mr. Gore, 64; 
Stars with Peculiar Spectra, Dr. H. Ludendorff, 64; 
an Interesting Visible Star, Prof. Barnard, 64; Catalogue 
of Double Stars, Prof. Doberck, 64; a r1oo-inch Reflect- 
ing Telescope, 81; Another New. Comet (1906 h), Joel 
Metcalf, 85; Mr. Hammond, 85; Comet 1906 h (Metcalf), 
Prof. Hartwig, 111; Dr. E. Strémgren, 111; M. Ebell, 
137, 208; E. Esclangon, 159; Prof. Kreutz, 159; Prof. 
Millosevich, 159; J. Guillaume, 167; Mr. Crawford, 350; 
Comet 1906 g, M. Ebell, 85; Prof. Kreutz, 86; Comet 
1906 g (Thiele), Prof. Hartwig, 111; Dr. E. Strémgren, 
r11, 1§9; Prof. Abetti, 137; Prof. Ambronn, 137; Prof. 
Nijland, 137; M. Ebell, 137; Messrs. Aitken and Faith, 
231; Ephemeris for Comet 1906 g (Thiele), Georg 
Dybeck, 257; Halley’s Comet, Dr. J. Holetschek, 86; 
F. W. Henkel, 616; Perturbations of Halley’s Comet, 
Messrs. Cowell and Crommelin, 447; the United States 
Naval Observatory Publications, 86; Some Astronomical 
Consequences of the Pressure of Light, Prof. J. H. 
Poynting, F.R.S., at Royal Institution, 90; Photographic 
Observations of Giacobini’s 1905 Comet, Prof. Barnard, 
111; Photographs of Giacobini’s Comet (1905 ¢), 326; 
Sunspots and Magnetism, William Ellis, 111; Naked-eye 
Observations of Venus, A. Benoit, 111; Observations of 
Venus, Mr. Denning, 208; the Markings and Rotation 
Period of Venus, Mr. Denning, 469; the Nature 
of the Atmospheres of Mercury and Venus, P. 
Salet, 239; the International Chart and = Cata- 
logue, 111; the Perseids, 1906, Prof. Zammarchi, 
111; the Collected Mathematical Works of G. W. 
Hill, 123; in the Days of the Comet, H. G. Wells, 124; 
Mira Ceti, T. W. Backhouse, 126; the Recent Maximum 
of Mira, P. M. Ryves, 378; the Spectrum of Mira, 
V. M. Slipher, 402; Spectrum and Radial Velocity of 
Mira, J. S. Plaskett, 518; Discovery of a Nova, Miss 
Leavitt, 137; Observations of Nova Sagittarii, Prof. 
Barnard, 137; Two Stars with Variable Radial Velo- 
cities, Prof. Hartmann, 137; Graphitic Iron in a 
Meteorite, W. Tassin, 137; New Variable Stars, Prof. 
Max Wolf, 137; Royal Astronomical Society, 143, 189; 
Systematic Motions of the Stars, A. S. Eddington, 143 ; 
Irregular Movement of the Earth’s Axis of Rotation, 
Prof. J. Larmor and Major E. H. Hills, 143; Cours 
d’Astronomie, Prof. H. Andoyer, 148; a Meteorite in 
the Atlantic (Ocober 17), C. B. Anderson, 159; Some 
Remarkable Small Nebule, Prof. Barnard, 159; the 
Period of 8 Cephei, Prof. Frost, 159; New Variable 
Stars, Miss Leavitt, 159; Prof. Pickering, 159; Ob- 
servations of Phcebe in 1906, 159; Systematic Stellar 
Motions, A. S. Eddington, 182; the Spectrocomparator, 
Dr. J. Hartmann, 182; Measurements of the Effective 
Wave-lengths in Stellar Spectra, Dr. H. E. Lau, 182; 
Early Observations of Jupiter’s Sixth Satellite, Miss 
Leavitt, 182; Jupiter’s Satellites, J. E. Martin, 231; 
K. Graff, 231; a White Spot on Jupiter’s Third Satel- 
lite, José Comas Sold, 281; Simultaneous Disparition 
of Jupiter’s Four Satellites, Enzo Mora, 448; Eclipses 
of Jupiter’s Satellites, 1878-1903, Prof. E. C. Pickering, 
616; the Red Spot on Jupiter, 1905-6, Stanley Williams, 
327; Simultaneous Observations of Jupiter, 569; a 
Century’s Progress in Astronomy, Hector Macpherson, 
173; Auroral and Sun-spot Frequencies Contrasted, Dr. 
C. Chree, 188; Sun-spots in 1905, 378; the Recent 
Large Group of Sun-spots, 425; Documents scientifiques 
de la Mission saharienne (Mission Foureau-Lamy 
d’Alger au Congo par le Tchad), F. Foureau, 200; 
Comet 1906 d (Finlay), M. Ebell, 208; Two 
Stars with a Common Proper Motion, Mr. Bel- 
lamy, Prof. Kreutz, Prof. Millosevich, 208; Through 
the Telescope, James Baikie, 222; Remarkable 
Lunar Halo, 228; the Lunar Crater Linné, Dr. 
Wirtz, 231; Prof. W. H. Pickering, 231; Ephemerides 
of Comets and Planets, 231; a Résumé of Aérography, 
L’Abbé Th. Moureux, 231; the Causes of Solar Pheno- 
mena, Don Horacio Bentabol y Ureta, 231; Parallax 
Investigations on 163 Stars mainly of Large Proper 
Motion, Frederick LL. Chase, Mason F. Smith, and 
William L. Elkin, 234; Experimental Reproduction 
of Lithospherical Folding, M. Hirtz, 239; Formula Ap- 
plicable to the Times. of Direct Rotation of the Planets 
and the Sun, Emile Belot, 239; Observations of Mars, 
José Comas Sola, 257; the Temperature of Mars, Prof. 
Lowell, 593; Transit-Circle Observations, Prof. Littell, 
257; the ‘‘ Companion to the Observatory,’’ 257; “‘ The 
Heavens at a Glance, 1907,’’ A. Mee, 257; the Tem- 
perature of the Moon, F. W. Very, 281; a Remark- 
able Nebula, Prof. Max Wolf, 281; Periodical Comet 
Due to Return in 1907, 282; Orbits of Three Double 
Stars, Prof. Doberck, 282; Side-lights on Astronomy 
and Kindred Fields of Popular Science: Essays and 
Addresses, Prof. Simon Newcomb, 294; Death ana 
Obituary Notice of Agnes M. Clerke, 299; the Proper 
Motion of Castor, Mr. Crommelin, 304; Line Intensity 
and Spectral Type, Dr. Sebastian Albrecht, 304; Silicon 
in the Chromosphere, Mr. Fowler, 304; the Solar 
