Nature, 7 
December 14, 1899 
Water of Salt Lake of Urmi, R. T. Giinther and J. J. 
Manley, 359; New Form of Relation ff, v, T)=o for 
Fluids, E. H. Amagat, 376 ; on the Calculation of Differential 
Coefficients from Tables involving Differences, with an 
Interpolation Formula, W. F. Sheppard, 390; Critical 
Pressure—a Suggested New Definition, Dr. R. H. Jude, 
412; Method for Determining Newtonian Constant, G. K. 
Burgess, 432; Death of O. G. Jones, 440; the Motion of a 
Perfect Liquid, Prof. H. S. Hele-Shaw, F.R.S., 446; Beats 
given by Vibrating Strings, C. Maltézos, 456; CBuvres Com- 
pletes de Christiaan Huygens publiées parla Société Holland- 
aise des Sciences, Dr. J. L. E. Dreyer, 457 ; Thermometric 
Scales for Meteorological Use, H. Helm Clayton, 491; on 
the Use of the Fahrenheit Scale for Observations on Sea 
Temperatures, William S. Bruce, 545; Solid Hydrogen, 
Prof. James Dewar, F.R.S., 514; the Field of Experimental 
Research, Prof. Elihu Thomson, 515; Limits of Solid State, 
G. Tammann, 540; Emission and ‘Absorption of Platinum- 
Black and Soot, F. Kurlbaum, 549; the Theory of the Pitot 
Tube and Woltmann Mill, Prof. A. Rateau, 549; Identity 
of Solution of certain Problems of Elasticity and Hydro- 
dynamics, G. Poisson, 588; the Maintenance of Solar 
Energy, 615; the Theory of the Physics of the Earth, P. 
Rudski, 623 (See a/so Section A, British Association) 
Physiography : the Wearing Away of Sand Beaches, W. H. 
Wheeler, 115 
Physiology : Intestinal Absorption, Prof. E. W. Reed, 
F.R.S., 23; How Natural Curliness of Hair is produced, 
Prof. Arthur Thomson, 44 ; Physiological Action of Choline 
and Neurine, Drs. F. W. Mott, F.R.S., and W. D. Halli- 
burton, F.R.S., 46; Influence of Freezing on Develop- 
ment of Hen’s Egg, Etienne Rabaud, 72; the Edinburgh 
Chair of Physiology, 84; Digestive Changes in Cells of 
Newt's Stomach, Dr. C. W. Carlier, 95 ; Action of Toluylene- 
Diamine on Red Blood- Corpuscles, iby Lapicque and A. 
Vast, 95; Elementary Physiology, Benjamin Moore, 99 ; 
Untersuchungen tiber*Strukturen, O. Biitschli, 124 ; Toxicity 
of Children’s Urine, MM. Lannelongue and Gaillard, 215 ; 
Crystallisation of Blood-Albumin, S. Gruzewska, 216; Soluble 
Animal Ferment Reductive of Nitrates, E. Abelous and E. 
Gérard, 264; Reducing Power of Urine, H. Hélier, 264; 
Echidnase, C. Phisalix, 288 ; Reducing Power of Extracts of 
Animal Organs, E. Abélous and E. Gerard, 312; Division of 
Nucleus in Spermatogenesis of Man, M. Sappin-Trouffy, 
312; the Relation of Motion in Animals and Plants to the 
Electrical Phenomena associated with it, Sir J. Burdon- 
Sanderson, Bart., F.R.S., 343 ; Thermogenesis and Use of 
Energy by Man in Raising and Lowering his own Weight, 
A. Chauveau, 360; General Physiology, Max Verworn, W. 
B. Hardy, 565 
Pickering, Prof. E. C., Saturn’s New Satellite, 21 
Pictures produced on Photographic Plates in the Dark, Dr. W. 
J. Russell, V.P.R.S., 208 
Piepers (M. C.), die Farbenevolution bei den Pieriden, 97 
Pieriden, die Farbenevolution bei den, M. C. Piepers, 97 
Pilcher (Percy S.), Death and Obituary Notice of, 546 
Pio (D. A.), Longitude from Moon Culminations, 538 
Pioneer Climbers, Francis Gribble, Prof. T. G. 
F.R.S., 274 
Pitard (E.), Three Crania from Swiss Lake Sites, 4o1 
Pitt (A. E.), Condensation of Oxalic Acid and Resorcinol, 47 
Plague of Frogs, a, F. H. Fortey, 246 
Plague in India, Success of Inoculation against, Dr. Chinoy, 
Bonney, 
548 
Plane and Solid Geometry, New, W. W. Beman and D. E. 
Smith, 517 
Planets: Saturn’s New Satellite, Prof. E. C. Pickering, 21; 
Rotation Period of Mars, W. F. Denning, 64 ; White Spot 
on Jupiter, Ph. Fauth, 161; the Fifth Satellite of Jupiter, 
Prof. E. E. Barnard, 207 ; the Red Spot on Jupiter, W. F. 
Denning, 210; Opposition of Jupiter 1899, 597 : Law Con- 
necting Motion in Planetary System, Ch. V. Zenger, 597 
Plans for Antarctic Exploration, the, 202 
Plant (E. C.), Geometrical-Drawing, 122 
Plants and their Environment, 409 
Plants, the Excretory Products. of, Prof. Hanriot, 608 
Plants, Fixation of Carbon by, Dr. Horace T. Brown, F.R.S., 
474, 544 
Platinum and Gas Thermometers, Comparison of, Drs. J. A. 
Harker and P, Chappius, 238 
Lndex 
XXXVI 
Platinum Thermometry, Discussion on, Prof. Callander, Dr 
J. A. Harker, Dr. Chappius, Mr. E. H. Griffiths, Prof. 
Carey Foster, Prof. Burstall, Principal Glazebrook, Dr. 
Chree, Prof. Threlfall, Mr. W. N. Shaw, 587 
Player (J. H.), Absorption Photographic Copving Process, 539 
Pleiades, Photometry of the, G. Miiller and P. Kempf, 429 
Plimmer (H. J-), Organism of Tsetse Fly Disease, 309 
Pliocene Deposits of the East of England, on a Proposed New 
Classification of the, F. W. Harmer, 610 
Pochettino (Dr. A.), Observations with Acoustic Resonators 
for determining how Modulus of Decay is affected, 17; Vari- 
ations of Peltier-effect in Magnetic Field, 400 
Poincaré (M.), Fourier’s Series, 52; Théorie 
Newtonien, 410 
Poisson (G.), Identity of Solution of certain Problems of 
Elasticity and Hydrodynamics, 588 
Polaris Multiple Star, the, Prof. W. W. Campbell, 577 
Polarisation Experiment, J. Cook, 8 
Pollock (J. A.), Quartz Thread Gravity Balance, 69 
Pollock (Prof.), a Portable Gravity Balance, 587 
Polyzoa, the Embryology of the, T. H. Taylor, 631 
Pope (W. J.), the Enantiomorphously related Tetrahydro- 
quinaldines, 71 ; Dextro-ac-tetrahydro-8-naphthylamine, 214 ; 
Resolution of Racemic Tetrahydroparatoluquinaldine into 
Optically Active Constituents, 214; on the Influence of 
Solvents on the Optical Activity of Organic Compounds, 609 
Porter (1. C.), Impressions of America, 291 
Portsmouth, Meeting of the British Medical Association at, Dr- 
F. W. Tunnicliffe, 341 
Potentiel Newtonien, Theorie du, Prof. H. Poincaré, 410 
Pottery Glazes, Lead Compounds in, Profs. T. E. Thorpe, 
BoORES un. Oliver and W. Burton, 18 
Pouget (M.), Volumetric Estimation of Zinc, 264; Metallic 
Sulphantimonites, 288 
Poulton (Prof. Edward B., F.R.S.), Natural Selection the 
Cause of Mimetic Resemblance and Common Warning 
Colours, 55; Peripatus in the Malay Peninsula, 591 
Poultry Conference, Official Report of the National, held at 
Reading in July 1899, 615 
Pouret (Ch.), Action of Bromine in Presence of Aluminium 
Chloride on Chloro-Benzene, 636 
Poynting (Prof. J. H., F.R.S.), Opening Address in Section A 
of the British Association, 470 
Practical Plane and Solid Geometry (Test Papers), 
Grace, 221 
Prain (Surgeon-Major D.), the Sale of Quinine in India, 
1897-8, 512 
Pratt (J. H.), the Separation of Alumina as Corundum from 
Molten Magmas, 516 
Precession Tables, Dr. Downing, 538 
Prehistoric Antiquities of our own Country, C. H. Read, 554 
Pressure, Critical, a Suggested New Definition, Dr. R. H. Jude, 
412 
Preston (Prof. Thomas, F.R.S.), Magnetic Perturbations of the. 
Spectral Lines, 175 
Prestwich (Sir Joseph), Life and Letters of, 265 
Primitive Constellations, R. Brown, jun., 31 
Prince (Charles Leeson), Death of, 14 
Printing in Colours, Machine for, Ivan Orloff, 299 
Prior (G. T.), Dust-fall in Mediterranean, 205 ; 
Composition of Tetrahedrite, 238 
Pritchard (Prof. U.), the Birth and Origin of Otological Science, 
350 
Process Year-Book for 1899, the, 590 
Professors, Duties of Provincial, 255, 292; Veritas, 316 
Progress in the Iron and Steel Industries, Sir W. C. Roberts- 
Austen, K.C.B., F.R.S., 38 
Progressive Lessons in Science, A. Abbott and Arthur Key, 
543 
Projective Geometry,'Premiers Principes de Géométrie Moderne, 
E, Duporeq, 314 
Provincial Professors, Duties of, 255, 292; Veritas, 316 
Psychology: Psychologie Untersuchungen iiber das Lesen, 
Benno Erdmann and Raymond Dodge, A. E. Taylor, 172 ; 
the Story of the Mind, J. M. Baldwin, A. E. Taylor, 172 ; 
the Emotions of Joy, Dr. G. V. N. Dearborn, 258; die 
Spiele der Menschen, Karl Groos, 363 ; de la Méthode dans 
la Psychologie des Sentiments, F. Rauh, 543; the Accuracy 
of Voluntary Movement, Dr. R. S. Woodworth, 549 
Pullen (W. W. F.), Tables and Data, 567 
du Potentiel 
George 
Chemical 
