‘Deslandres and L. d’Azambuja: Laws relating to the 
-structure of band spectra and to the deviations from | 
“their arithmetical series. 
-Moureu, P. Th. Muller, and J. Varin: Refraction an 
‘acetylene group. Experimental data are given for 
-ninteen substances containing the group —C=C~—.— 
‘integral number of beats of the chronometer. 
NovEMBER 6, 1913] 
NATURE 311 
Paris. 
Academy of Sciences, October 27.—M. P. Appell in 
-the chair.—The President announced the death of M. 
Lucas Championniére.—Maurice Hamy: An arrange- 
-ment of spectrograph with an objective grating suit- 
able for the measurement of radial velocities.—H. 
A study of the second group | 
of nitrogen bands. The formula expressing the re- | 
sults differs from that applicable to line spectra.—Ch. | 
compounds containing na 
magnetic rotation of 
M. Depéret was elected a non-resident member.—A. 
Claude and L. Driencourt: A coincidence micrometer 
free from the personal equation. This method is 
based on the use of a deformable micrometer network, 
one set of wires being capable of moving, retaining 
their parallelism; the distance between the wires is 
equal to the path described by the image of an 
equatorial star in the principal focal plane during an 
So soon 
as the star enters the field, the first wire is set to 
coincide with the image at a beat of the chronometer. 
If the adjustment is exact, the passage over the next 
wire will also coincide with a beat, and this can be 
repeatedly verified. The method of observation is 
capable of a very high precision—P. Chofardet: 
Observations of the new comet 1913e (Zinner) made 
at the Observatory of Besancon.—Jean Chazy: Cer- 
tain trajectories of the problem of n bodies.—MM. 
Chipart and Liénard: The sign of the real part of the 
roots of an algebraic equation.—Georges Rémoundos :; 
The theorem of Picard in a circle of which the centre 
is a critical algebraic point.—Maurice Janet: The 
existence and determination. of solutions of systems 
of partial differential equations.—Henri Villat: The 
validity of the solutions of the problems of hydro- 
dynamics.—Emile Borel: Kinematics in the theory of 
relativity—M. Girousse: The electrolysis of lead and 
iron in the.soil: a discussion of the effects of stray 
currents from tramway systems. It is pointed out 
that the usual rule, a drop of potential of not more 
than one volt per kilometre, is insufficient. The 
essential point is the difference of potential between 
the metallic substances capable of being attacked and 
the tramway rails. It is shown that the amount of 
moisture in the soil is one of the main factors of the 
problem. The resistance of the contact surface is 
also important; the contact of lead with earth is much 
more resistant than the contact of iron with earth. 
No critical potential is required to produce electro- 
lytic effects.—G. Sagnac: Luminous zther demon- 
strated by the effect of the wind relative to the zther 
in an interferometer in uniform rotation.—L. Gay : 
The:pressure of expansibility of normal liquids.—M. 
Tafianel: The combustion of gaseous mixtures and 
gaseous velocities—Clément Berger: The preparation 
of aluminium ethylate. Amalgamated aluminium 
reacts with alcohol in presence of a small quantity of 
sodium ethylate, and pure aluminium ethylate can be 
isolated from the resulting solution.—Ch. Boulanger 
and J. Bardet : The presence of gallium in commercial 
aluminium and its separation. The spectrographic 
examination of commercial aluminium showed strong 
gallium lines, and a successful attempt was made to 
isolate gallium from this product. 1-7 kilograms of 
the metal were dissolved in hydrochloric acid, treated 
with sulphuretted hydrogen first in hydrochloric acid 
and then in. acetic acid solution, and the product 
heated with potash solution to remove iron. 0-3895 
gram of gallium oxide was obtained, or o-o17 per 
NO. 2297, VOL. 92] 
| B-rhodanine, 
cent. of metallic gallium on the aluminium taken. 
The purity of the product was proved spectroscopic- 
ally—R. Bossuet and L. Hackspill: A group of 
metallic phosphides derived from the hydrogen phos- 
phide P,H,. Rubidium phosphide, Rb,P,, dissolves 
readily in liquid ammonia, and this reacts with a solu- 
tion of lead nitrate in the same solvent, giving the 
corresponding lead phosphide, PbP,. Other metals 
give similar phosphides, but their purification offers 
great difficulties—Roger Douris: The addition of 
hydrogen to a secondary alcohol derived from furfurol 
in presence of nickel. A study of the reduction pro- 
ducts of ethylfurfurylcarbinol—P. Lemoult: Leuco- 
bases and colouring matters derived from diphenyl- 
ethylene. The action of the ethyl and methyl mag- 
nesium iodides upon . Michler’s ketone.—Marcel 
Mirande; The existence of a cyanogen compound in 
Papaver nudicaule.—P. Sisley and Ch. Porcher: The 
elimination of artificial colouring matters by the 
lacteal glands. Various harmless dyestuffs (uranine, 
methylene blue, dimethyl-amino-azo- 
benzene) were administered to goats 2nd dogs, both 
by ingestion and injection. The colouring matters 
were almost completely arrested by the lacteal glands, 
little or no colour appearing in the milk.—Em. 
Bourquelot, H. Hérissey, and J. Coirre: The bio- 
chemical synthesis of a sugar of the hexabiose group, 
gentiobiose.—Sabba Stefanescu: The phylogeny of the 
crown of the molars of mastodons and elephants. 
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