Nature, Lndex xlv 
June 13, 1997 
Engineering for Second-year Students, J. Paley Yorke, 
389; the Electrician Primers, 389; Electricity of To- 
day, its Work and Mysteries described in Non-Technical 
Language, Charles R. Gibson, 389 
Solutions, Application of Van der, Waals’s Equation to, 
Earl of Berkeley, 549 
Solway, Instituts, Travaux de 1’Institut de Sociologie, 
236 
Eeiervell (Edith L.), a Rhythmic Approach to Mathe- 
matics, 409 ? 
Sommerfeldt (Ernst), Geometrische Kristallographie, 485 ; 
Physilalische Kristallographie vom Standpunkt der 
Strukturtheorie, 605 
Soot, Electrical Method of Extracting, from Air in Flues, 
G. W. Walker, 606 
South Africa, Geological Research in, 115 
South African Philosophical Society, 192, 287 
Southerns (L.), Dependence of Gravity on Temperature, 
142 
Southwell (T.), Arctic Whaling in 1906, 542 
Species and Varieties, their Origin by Mutation, H. de 
Vries, 268 
Spectroscopy: Fact and Theory in Spectroscopy, Prof. H. 
Crew, 353; Vorlesungen tiber teoretische Spektroskopie, 
Prof. A. Garbasso, 554 
Spectrum Analysis: the 'Telluric Lines in the Solar Spec- 
trum, M. Stefanik, 64; Character and Cause of Sun- 
Spot Spectra, George E. Hale, Walter S. Adams, and 
Henry G. Gale, 113; Recent Progress in Magneto- 
optics, Prof. P. Zeeman at Royal Institution, 138, 
160; Anode Rays, Dr. R. S. Willows, 173; Messrs. 
Gehrcke and Reichenheim, 614; the Spectrocomparator, 
Dr. J. Hartmann, 182; Measurements of the Effective 
Wave-lengths in Stellar Spectra, Dr. H. E. Lau, 182; 
Influence of a Strong Magnetic Field on the Spark 
Spectra of Titanium, Chromium, and Manganese, J. E. 
Purvis, 189; Fluorescence and Magnetic Rotation Spec- 
tra of Sodium Vapour, Prof. R. W. Wood, 230; Spec- 
trum Lines as Light Sources, Mr. Bates, 233; Luminous 
Radiations and the Richness of Wheat in Nitrogen, J. 
Dumont, 239; JIonisation and Absorption and Anoma- 
lous Dispersion, Dr. G. A. Schott, 271; Ionisation and 
Anomalous Dispersion, Prof. R. W. Wood, 390, 583; 
G, A. Schott, 461; the Helium Line D,, in the Solar 
Spectrum, Mr. Buss, 281; Ultra-violet Fluorescence of 
Benzene, Dr. J. Stark, 295; Line Intensity and Spectral 
Type, Dr. Sebastian Albrecht, 301: Silicon in the 
Chromosphere, Mr. Fowler, 304; Variation of Wave- 
lengths in the Solar Spectrum, Dr. Halm, 304; Calcium 
as an Absorbent of Gases and its Applications in the 
Production of High Vacua and for Spectroscopic Research, 
Frederick Soddy, 309; Measurements of the Zeeman 
Effect on the Blue Lines of Zinc, P. Weiss and A. 
Cotton, 335; the Principal Lines of the Spark Spectra 
of the Elements, Dr. J. H. Pollok, 359; the Spectro- 
scopic Binary o Leonis, W. Zurhellen, 378; Improvements 
in Spectrophotometers, F. Twyman, 382; the Spectrum 
of Mira, V. M.Slipher, 402 ; Spectrum and Radial Velocity 
of Mira, J. S. Plaskett, 518; the Absorption Spectra of 
Phthalic, tsoPhthalic, and Terephthalic acids, Phthalic 
Anhydride and Phthalimide, W. N. Hartley and E. P. 
Hedley, 406-7; the Spectroscopic Binary A Andromede, 
Mr. Burns, 425; Stars having Peculiar Spectra, Mrs. Flem- 
ing, 448; Constitution of Hydroxyazo-compounds, W. B. 
Tuck, 477; Series in Spectra, Prof. A. W. Conway, 470: 
Phosphorescence of Uranium Salts in Liquid Air, Henri 
_ Becquerel, 479; the Origin of Spectra in Series, W. Ritz, 
528; Presence of Europium in Stars, Joseph Lunt, 540; 
Adam Hilger’s 1907 Wave-length Spectroscope, 568; 
Contribution to the Study of Phosphorescence, Henri 
Becquerel, 575; Photography of the Infra-red Solar Spec- 
trum, G. Millochau, 599; New Glass Transparent to 
Rays of Very Short Wave-length, F. A. Lindemann and 
C. L. Lindemann, 614 
Speech, Lectures upon the Mechanism of, Alexander 
Graham Bell, Prof. John G. McKendrick, 196 
Speech Curves, Researches in Experimental Phonetics, the 
Study of, Dr. E. W. Scripture, Prof. John G. McKend- 
rick, F.R.S., 302 
Spéléologie au XXe Siécle, la, E. A. Martel, Prof. Gren- 
ville A. J. Cole, 50S 
Spence (Wilfrid L.), Mechanism of Power ‘Transmission 
from Electric Motors, 591 
Spencer (Prof. Baldwin), Emu Remains from King Island, 
Bass Strait, 228 
Sperry (E. S.), the Manufacture of Rolled Sterling-silver, 
496 
Spherical Gaseous Nebula, Homer Lane’s Problem of a, 
Lord Kelvin, O.M., F.R.S., 368 
Spiderwort, the Evolution of the Colorado, Prof. T. D. A. 
Cockerell, 7 
Spraying, lonisation by, A. S. Eve, 533 
Spring (Prof. Walthére), Material obtained by Decompos- 
ing a Solution of Hydrogen Sulphide with Sulphur Di- 
oxide is a Hydrate having the Composition S,,H,O, 182 
Spurr (J. E.), Geology of the Tonopah Mining District, 
Nevada, 184. 
Stainer (W. J.), Junior Practical Mathematics, 409 
Standard Electric Glow Lamps, 380 
Standards and Exact Measurement, Dr. R. T. Glazebrook 
at Institution of Electrical Engineers, 570 
Standards, Recent Work of the American Bureau of, Dr. 
J. A. Harker, 233 
Standen (R.), Mollusca collected by Mr. S. A. Neave in 
South-east Rhodesia, 216 
Standing (H. F.), Subfossil Prosimiz from Madagascar, 
574 
Stanford’s Octavo Atlas of Modern Geography, Geo. G. 
Chisholm, Supp. to March 14, v. 
Stark (Dr. J.), Ultra-violet Fluorescence of Benzene, 295 
Starling (Prof. Ernest H., F.R.S.), Mercers’ Company 
Lectures on Recent Advances in the Physiology of Diges- 
tion, 219 
Stars: the System of 61 Cygni, Prof. Barnard, 40; Desig- 
nations of Newly-discovered Variable Stars, 41 ; the Num- 
ber of the Visible Stars, Mr. Gore, 64; Stars with Pecu- 
liar Spectra, Dr. H. Ludendorff, 64; an Interesting 
Variable Star, Prof. Barnard, 64; Catalogue of Double 
Stars, Prof. Doberck, 64; Orbits of Three Double Stars, 
Prof. Doberck, 282; the Maximum of Mira, Prof. Nijland, 
17; 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; Observations of Nova Sagit- 
tarii, Prof. Barnard, 137; Two Stars with Variable 
Radial Velocities, Prof. Hartmann, 137; Stars with 
Variable Radial Velocities, 378; Discovery of a Nova, 
Miss Leavitt, 137; New Variable Stars, Prof. Max 
Wolf, 137; New Variable Stars, Miss Leavitt, 159; Prof. 
Pickering, 159; the Period of 8 Cephei, Prof. Frost, 159; 
Systematic Stellar Motions, A. S. Eddington, 182; 
Measurements of the Effective Wave-lengths in Stellar 
Spectra, Dr. H. E. Lau, 182; Two Stars with a Common 
Proper Motion, Mr. Bellamy, Prof. Kreutz, Prof. Millo- 
sevich, 208; Parallax Investigations on 163 Stars, 
mainly of Large Proper Motion, Frederick L. Chase, 
Mason F. Smith, and William L. Elkin, 234; the Proper 
Motion of Castor, Mr. Crommelin, 304; a Peculiar Short- 
period variable (155.1906, Cassiopeize), Messrs. Miiller 
and Kemp, 327; a Catalogue of 8560 Astrographic 
Standard Stars between Declinations —40° and —52° 
for the Equinox 1900 from Observations made at the 
Royal Observatory, Cape of Good Hope, during the 
Years 1896-99, under the Direction of Sir David Gill, 
K.C.B., F.R.S., 331; Catalogues of Stars for the Equinox 
1900°0 from Observations made at the Royal Observatory, 
Cape of Good Hope, during the Years 1900-1904, under 
the Direction of Sir David Gill, K.C.B., F.R.S., 331; 
Astrographic Catalogue 19000, Oxford Section, Dec. 
“peal to) --32° Prof. Hi. Hi: Durners FORIS:, 3313 a 
Quickly Changing Variable Star, F. H. Seares, 350; 
Thirty-six New Variable Stars, Miss Leavitt, 402; the 
Spectroscopic Binary A Andromedz, Mr. Burns, 425; 
Photographs of Faint Stars, Prof. E. C. Pickering, 448; 
Stars having Peculiar Spectra, Mrs. Fleming, 448; 
Standard Stellar Magnitudes, Prof. Pickering, 518; Two 
Rapidly Changing Variable Stars, J. Baillaud, 518; the 
Sun as a Variable Star, Prof. Turner, 569; Radial Velo- 
city of » Piscium, 569; a New Variable or Nova, 156.1906, 
Prof. E. Millosevich, 615 
Statistics: Report on Mines and Quarries, Number of Per- 
sons Employed in British Mines and Quarries, 15; Re- 
