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coefficients in its irreducible components : Prof. W.
Paris. Burnside. The first part of the paper contains a deter- Acadenty of Sciences, March 6.-M. Troost in the chair. mination of the number of times that any given irreducible - The president read a telegram from Dr. Jean Charcot component occurs, when any representation of a group of concerning the work of the Antarctic Expedition.--On the finite order as a transitive permutation group is completely orthogonal trajectories of a family of surfaces : Gaston reduced. The second part of the paper is occupied with the Darboux.-A rational formula for the coefficient of abactual reduction of the permutation group. The reduction | sorption of light by a translucent body : J. Boussinesq. takes two forms according as the domain of rationality is –The study of 1-methyl-4-benzylcyclohexanol and i-methyldefined by the characteristics, or by the roots of unity of 4-dibenzylcyclohexanol : A. Haller and F. March. Methylwhich the characteristics are functions.-On the theory of cyclohexanone reacts with sodium derivatives of alcohols in the logarithmic potential : Prof. T. J. l’A. Bromwich. a manner resembling camphor, the sodium derivative of The paper is occupied with the conditions for the existence benzyl alcohol giving a mixture of methyl-benzyl- and of the second differential coefficients of the potential within methyl-dibenzyl-hexanol, separable by fractional distillation an area carrying surface-density, and of the first differential in a vacuum.-Eumedon convictor, a crustacean accomcoefficients of the potential on a curve carrying line-density. panying a sea-urchin : E. L. Bouvier and G. Seurat. It a corner of the area in the first case, or of the curve The Eumedon occupies a pouch near the anal region of in the second, the differential coefficients in question do not the sea-urchin, and is well protected by the long spines exist unless the axes of coordinates have certain special of the latter. The crustacean is not parasitic on its host, directions.--Alternative expressions for perpetuant types :
the relations between the two closely resembling those P. W. Wood.--An informal communication on the theory | holding between Pionodesmotes phormosoae and the seaof geodesics was made by Prof. Forsyth.
urchin Phormosoma uranus.-On the constitution of sun
spots : Th. Moreux. A discussion of the penumbra of the CAMBRIDGE.
large sun-spot of January, 1904, of which a drawing is Philosophical Society, February 27. - Mr. F. H. Neville given. The second penumbra, attributed by some observers in the chair.-Soluble forms of metallic dihydroxytartrates : to irregularities in the nucleus of the spot, is clearly shown, H. J. H. Fenton, F.R.S. Sodium dihydroxytartrate is re
and the author regards this as an additional proof of the markable for its very sparing solubility in water, and it
theory advanced by him in June, 1900.-On sliding friction : has previously been shown by the author that this property L. Lecornu. The author considers that the law of may be made use of for the qualitative and quantitative Coulomb cannot be regarded as rigorously true, but is estimation of sodium. When equivalent quantities of rather an empirical rule only roughly approximate.—The dihydroxytartaric acid and sodium ethylate are mixed in
oscillations of railway carriages on their springs : Georges alcoholic solution a semi-transparent gelatinous precipitate Marié. The author has deduced a relation between the is obtained which is altogether unlike the salt above
periodic variations in level of the permanent way, the mentioned and is extremely easily soluble in water. Its | friction of the spring, and the deflection of the spring, and aqueous solution after standing for a few minutes deposits a
has applied this experimentally to various classes of rolling while, crystalline precipitate of the sodium salt in its ordinary stock. As a rule, the condition of convergence was realised, hydrated form. The calcium salt shows a similar behaviour, but there were a few faulty vehicles in which this was not and it would appear that the ordinary metallic dihydroxy- the case. --On the determination by the chronometer of tartrates must be regarded as derivatives of a hydrated form differences of latitude at Madagascar and Réunion : M. of the acid C,H,,.-Studies on unsaturated ketonic com- Driencourt. The data given have a probable accuracy pounds : S. Ruhemann. The author has continued his re
This precision is rarely attained in such searches on the combination of mercaptans with unsaturated measurements, and details of the working methods are ketones (see Trans. Chem Soc., 1905, Ixxxvii., 17). In the light given.-On the determination of gaseous densities and the of previous researches, an explanation is given of the catalytic accuracy possible in such measurements : A. Leduc. For action of organic bases in the formation of additive products the more permanent gases the author regards the possible of mercaptans with unsaturated ketonic compounds.--Some accuracy in the density as about 1 in 10,000 ; for the more compounds of guanidine with sugars : R. S. Morrell and easily condensable gases the probable accuracy is lower. A. E. Bellars. The addition of guanidine to a solution of The results recently published by MM. Moissan and any sugar in absolute alcohol causes a precipitate of an Chavanne, Moissan and Binet du Jassoneix, Guye and addition product of the sugar and the base. The compounds | Pintza, and Jacquerod and Pintza are criticised.— The are only slightly hydrolysed in aqueous solution, but they action of radium bromide on the electrical resistance of are easily decomposed by acids. Their optical properties metals : Bronislas Sabat. Bromide of radium, placed near are peculiar ; in some cases the rotation angle is opposite wires of bismuth, iron, steel, copper, platinum, brass and in sign to that of the parent sugar, in others there is a German silver, increases their electrical resistance. This marked multi-rotation. The influence of strong electro- effect cannot be wholly attributed to the rise of temperature magnetic fields on the spark spectra of some metals : J. E. caused by the radium salt.-Contribution to the study of Purvis. The electromagnet is an exceptionally strong one. ionisation in flames : Pierre Massoulier. Previous exThe pole pieces are conical, and the strength of the field perimenters have employed electrodes placed one above the betwe’n the two poles with a current of 25 amperes is other in the flame, and the dissymmetry thus necessarily 40,000 C.G.S. units. It was placed in such a position that introduced partially masks the results. The author employs a line joining the poles was perpendicular to a line drawn vertical electrodes placed symmetrically in the fame, and from the slit to the grating. The metals of which an the reversal of the field is then without effect on the course account is given are gold, bismuth, antimony, lead, and of the phenomena. Curves are given showing the relation tin. The results so far show that amongst the various lines between the distances from the electrodes and the fall of a considerable number are divided into triplets; whilst, of potential.-The variations of the equivalent spark of an those which do not show any division, some seem to be X-ray tube : S. Turchini. On the time that appears before widened when the spark is in the field. By analysing the precipitation appears in solutions of hyposulphites : Gaston divided lines by means of a calcite crystal, the components Gaillard.—On the electrolytic solution of platinum in do not seem to be polarised in the same way; i.e. the outside sulphuric acid : André Brochet and Joseph Petit. Platcomponents of one triplet are vibrating perpendicular to the inum is dissolved in sulphuric acid under the action of a lines of force, whilst those of another are parallel to the variable current, and the action of the alternating current lines of force, and the same applies to the inner component. is not specially due to the change in the sense of the Some lines appear as doublets; but in many cases most current. In the presence of an oxidising agent the solution probably the doublets are reversals, and these phenomena of the platinum is impeded.-A comparison of the physical are particularly marked amongst the lines of antimony and properties of pure nickel and cobalt : II. Copaux. Nickel bismuth. It will be necessary to study these with the and cobalt have been obtained practically free from other magnet placed "end on." Two lines may be very close metals, and containing only one or two thousandths of ingether, one stronger than the other, and the stronger line non-metallic impurities. They are magnetic, very crystalwill be divided into three, whilst the weaker one is slightly line metals, not malleable in the cold. They differ in apwidened only. The work is still in progress, and with other pearance, cobalt being bright, resembling silver, whilst metals.
nickel is dull. Determinations of the density, hardness,
melting point, electrical resistance, and breaking load are
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Royal INSTITUTION, at 3.-Electrical Properties of Radioactive Sub 12 per cent. of chloroform there is no possibility of es- stances : Prof. J. J. "Thomson, F.R.S. tablishing an equilibrium between the blood and the mixture, since this equilibrium would correspond to a fatal dose of chloroform. The variable equilibrium which is actually produced depends largely on the pulmonary ven
PAGE tilation.-On the secreting power of the kidney : Henri Lamy and André Mayer.—The spectroscopic study of
Modern Optical Theory.
457 oxyhæmoglobin : M. Piettre and A. Vila.-The action of
Technical Analysis. By J. B. C. ammoniacal salts on the nitrification of sodium nitrite by
The Zoological Record. By R. L.
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M. B. of the High Atlas in the region of Glaoui, Morocco : Paul
Guttmann : Lemoine.—Examination of the fossils brought from the
Percentage Tables for Elementary Yunnan by the Lantenois expedition : H. Mansuy. The
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461 THURSDAY, MARCH 16. The Planet Fortuna.-W. T. ; W. E. P.
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461 Sir William Ramsay, K.C.B., F.R.S.-A Preliminary Note upon the Progress in Aërial Navigation. By Prof. G. H. Question of the Nutrition of the Early mbryo: E. Emrys-Roberts. On the Absence or Marked Diminution of Free Hydrochloric Acid in the
403 Gastric Contents, in Malignant Disease of Organs other than the
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