Tscherning's theory, as opposed to that of Helmholtz.Observations on the absorption bands of blood and oxyhæmoglobin MM. Piettre and Vila.-Myelitis produced by tuberculous toxins: E. Clément.--On the constitution of Djebel Hadid Paul Lemoine. On the Eocene strata in Western Morocco: A. Brives. On the mode of formation of high glacial valleys: Paul Girardin. NEW SOUTH WALES. Royal Society, November 16, 1904.-Mr. C. O. Burge, president, in the chair.-On the occurrence of isolated crystals of augite in the tufaceous mudstones near the top of the upper marine series at Gerringong: H. G. Foxall. The author gives the results of crystallographical and chemical examinations of isolated crystals of augite, together with a note on their occurrence. December 7, 1904.-Mr. C. O. Burge, president, in the chair.-Mr. C. O. Burge delivered his presidential address on the connection between engineering and science. Among the future triumphs of engineering helped by science were mentioned the application of electricity to main line railways. Then there are promises as regards conveyance of power by electricity without wires. Increased economy in the utilisation of heat units in the ordinary steam engine will be a work of the future, thus saving our rapidly diminishing fuel supply. Other subjects mentioned as fit ones for the future were the direct utilisation of the sun's rays for power, and of the rise and fall of the tide for the same purpose; the diminution of skin friction in ships; and of the resistance to air in ships and trains; the dispersion of fog by electricity; the further investigation of fatigue in metals used for construction; and the application of single phase electricity to traction. The approximate colorimetric estimation of nickel and cobalt in presence of one another: R. W. Challinor. Use is made of the complementary colours of Ni and Co solutions. The method is to be applied to the solution of the weighed Ni and Co deposited by electrolysis. The mixed metals are dissolved in HNO,, the solution evaporated and diluted to a definite volume and a fraction taken. Standard Ni (NO3), or Co (NO), solution is added until the colour matches a neutral tinted solution of known strength; both solutions are brought finally to the same dilution, the colours being compared by looking vertically down the tubes.-Note on a combined wash-bottle and pipette: J. W. Hogarth. DIARY OF SOCIETIES. THURSDAY, FEBRUARY 16. ROVAL SOCIETY, at 4.30.- Polarised Röntgen Radiation: Dr. C. G. Barkla.-The Effects of Momentary Stresses in Metals: Prof. B. Hop kinson. The Halogen Hydrides as Conducting Solvents. Parts I. IV.: B. D. Steele, D. McIntosh, and E. H. Archibald.-Further Observations on Slip-bands. Preliminary Note: W Rosenhain. ROYAL INSTITUTION, at 5-Recent Work of the Geological Survey: Prof. J. J. H. Teall, F.R S. SOCIETY OF ARTS, at 4.30 -The Indian Census of 1901: Sir Charles A. Elliott, K.C.S.I. LINNEAN SOCIETY, at 8.-A Revised Classification of Roses: J. G. Baker, F.R.S.-The Botany of the Anglo-Gerinan Uganda Roundary Commission E. G. Baker, Spencer Moore, and Dr. A. B. Rendle. Schistose Breccia: Rev. J. F. Blake.-On the Wash-outs in the Middle Coal-measures of South Yorkshire: F. E. Middleton. SOCIETY OF ARTS, at 8.-Some Misconceptions of Musical Pitch: John E. Borland. THURSDAY, FEBRUARY 23. ROYAL SOCIETY, at 4.30-Probable Papers: On some New Species of Lagenostoma: a Type of Pteridospermous Seed from the Coal-measures: E. A. Newell Arber.-On a New Rhabdosphere: G. Murray, F.R.SOn Changes observable in the Liver Cells during Digestion, and their Relation to Hepatic Secretion: Prof. E. Wace Carlier.-The ColourPhysiology of the Higher Crustacea. Part III.: F. Keeble and Dr. F. W. Gamble.-Phosphorescence caused by the Beta and Gamma Rays of Radium. Part 11.-G. T. Beilby. ROYAL INSTITUTION, at 5.-Recent Work of the Geological Survey: Prof. J. J. H. Teall, F.R.S." INSTITUTION OF ELECTRICAL ENGINEERS, at 8.-Continuation of Dát cussion:-The Value of Overhead Mains for Electric Distribution in the United Kingdom: G. L. Addenbrooke. FRIDAY, FEBRUARY 24. ROYAL INSTITUTION, at 9.-Fungi: Prof. H. Marshall Ward, F.R.S. PHYSICAL SOCIETY, at 5.-On the Curvature Method of teaching Ge metrical Optics: Dr. C. V. Drysdale. -Exhibition of Dr Meislings Colour Patch Apparatus: R. J. Sowter A Method of illustrating the Laws of the Simple Pendulum, and an Exhibition of String Models of Optical Systems: J. Schofield. INSTITUTION OF CIVIL ENGINEERS, at 8.-Morecambe Sewerage: Method of Laying a 15-inch Cast-iron Sewer under the London and NorthWestern Railway: F. D. Flint.-The Reconstruction of Bow Endge over the River Lea: H. M. Rootham. Animal Life. (Illustrated.) By R. L. Notes on Stonehenge. III The Earliest Circles. (Illustrated.) By Sir Norman Lockyer, K. C.B., F.R.S. 366 367 The Condition of Chemical Industries in France. By W. R. 360 369 371 Blood Pressures in Man. Allbutt, F.R.S. Additional Periodical Comets due this Year Castor a Quadruple Star 374 374 375 By Prof. T. Clifford 375 376 377 377 379 379 384 Notes Our Astronomical Column: Radiation Pressure. By Prof. J. H. Poynting, Geographical Results of the Tibet Mission Diary of Societies ADAM HILGER, LTD., MAKERS OF Prisms of Glass, Quartz, Iceland Spar, and other Materials. Nicol, Foucault, Hartnack, Thompson, Rochon, Wollaston, and other Polarising Prisms. Special and Experimental Optical Work a Speciality. 75a CAMDEN ROAD, LONDON, N.W. Awarded Gold Medal St. Louis Exhibition, 1904. Telegraphic Address:-"Sphericity, London." CATALOGUE ("A") OF SPECTROSCOPES AND SPECTROSCOPIC ACCESSORIES GRATIS. DINES' NEW SELF-RECORDING MERCURIAL BAROMETER JAMES J. HICKS, Designed to give a trace from which the height at any time may be determined to 005 inch. 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TUESDAY, FEBRUARY 21, AT 12.30. MR. J. C. STEVENS will Offer at his Rooms, 38 King Street, Covent Garden, London, W.C., a fine Collection of British Birds formed by the late W. F. URWICK, Esq., beautifully mounted and cased. Also interesting duplicates from the Collection of the late S. E. SHIRLEY, Esq., varieties of Grouse, &c., and about two hundred lots of Eggs and Skins from other sources. On view day prior 10 to 4, and morning of sale. Catalogues on application. LIVING SPECIMENS FOR THE MICROSCOPE. Volvox, Spirogyra, Desmids, Diatoms, Amoeba, Arcella, Actinosphærium, Vorticella, Stentor, Hydra, Floscularia, Stephanoceros, Melicerta, and many other specimens of Pond Life. Price 1s. per Tube, Post Free. Helix pomatia, Astacus, Amphioxus, Rana, Anodon, &c., for Dissection purposes. THOMAS BOLTON, 25 BALSALL HEATH ROAD, BIRMINGHAM. MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM. THE LABORATORY, PLYMOUTH. 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