‘and the magnetising action of Maurain. 
JANUARY 15, 1914| 
NATURE 
573 
gas containing more than about 12 per cent. of SO, as 
a maximum when all the oxygen of the air supplied 
-was used up, and the author states that his various 
attempts to obtain more than this in practice by keep- 
ing burner gas long in contact with incandescent 
pyrites have failed—L. C. Jackson, L. McNab, and 
A. C. H. Rothera: The electrical conductivity of milk 
during the concentration, with suggestions for a prac- 
tical method of determining the end point in the manu- 
facture of sweetened condensed milk. Although the 
measurement of electrical conductivity is of no value 
_in determining the degree of concentration of a 
separated unsweetened milk, it can be made the basis 
of a working process for watching the concentration 
of sweetened whole mil. A device in which the re- 
sistance of sweetened milk in the vacuum pan is com- 
pared with that of an approved sample of condensed 
milk maintained at exactly the same temperature is 
described.—S. J. Johnstone: Monazite from some new 
localities. Wide variation may occur in the quantity 
of thoria present in samples; notable amongst these 
are ranges shown by those. from Ceylon, the thoria 
percentage of which varies from 95 to 28-2; from 
Malava, 3-4 to 9-4; and from northern Nigeria, 2-3 
to So. 
Paris. 
Academy of Sciences, January 5.—M. P. Appell in the 
chair.—L. Lecornu: A project of “Monument de 
Vheure.”’ Suggestions for the erection of a monu- 
ment at Villers-sur-Mer on the meridian of Greenwich. 
—R. de Forcrand; Ferrous sulphate and its hydrates. 
Methods are given for preparing the hepta-, tetra-, and 
mono-hydrates of ferrous sulphate in a pure state. The 
pure anhydrous salt could not be prepared, some basic 
sulphate being always present. The heats of solution 
of these four salts are given.—M. Coggia: Observa- 
tions of the comet 1913f (Delavan) made at the Ob- 
servatory of Marseilles with the comet-finder. Posi- 
tions are given for December 21 and 22.—Ch. Platrier : 
A characteristic property of surfaces of constant 
negative total curvature.—E, Goursat; Certain exten- 
sions of Stokes’s formula.—Emile Borel: Some 
‘problems of geometrical probabilities and hypotheses 
of discontinuity.—Pierre Weiss: The molecular field 
Maurain has 
studied experimentally the magnetic properties of iron 
deposited electrolytically in a magnetic field; it is 
shown that the law of variation with distance (in- 
versely as the sixth power) previously deduced by the 
author holds in this case.—Marcel Boll and Victor 
‘Heati: The non-influence of oxygen on certain photo- 
chemical reactions. Two reactions were studied, the 
decomposition of tetrachloroplatinic acid, and ot oxalic 
acid in presence of uranyl nitrate, and the reaction 
velocities in absence and presence of air compared. 
It is shown that Bodenstein’s theory is inapplicable to 
these two photochemical reactions.—L. Gay: The rela- 
tions between the covolume b and the critical con- 
stants. The critical constants of substances not 
strongly polymerised can be determined with fair 
accuracy from the constancy of the _ ratios 
V,/b and Ré/zb.—Paul Pascal: The magnetic 
properties of the alkali metals in their com- 
pounds.—Manuel Veres: Researches on cadmium 
Description of the preparation and properties of the 
double sulphate, 2CdSO,.(NH,),SO,—A. Bouzat and 
Ed. Chauvenet: The heat of formation of some com- 
pounds of cupric chloride with ammonium chloride.— 
H. Taffanel : The combination of gaseous mixtures and 
reaction velocities.—A. Sartory, J. Gratiot, and F. 
Thiébaut: The rejuvenation of the potato. Experi- 
ments on raising potatoes from seed. The plants 
raised were vigorous and free from disease.—Marcel 
Dubard : General remarks on the place and characters 
of classification of the Mimusopez.—J. Magrou ; Sym- 
NO. 2307, VOL. 92] 
' biosis and tuber formation in the potato. It has been 
found by experiment that with the potato growing on 
poor soils, comparable with soil in which the wild 
potato is found, symbiosis exercises a decisive influence 
on the formation of the tubers. These results are in 
agreement with views of Noél Bernard on symbiosis 
and evolution.—Etienne Rabaud: The experimental 
study of an instinct. A study of the conditions govern- 
ing the migration of Myelois cribrella in its larval 
state, from the head to the stem of the plant serving 
as its host.—M. Lécaillon: Rudimentary partheno- 
genesis in the golden pheasant (Phasianus pictus).— 
Max Kollmann and Louis Papin: The chondriome of 
the Malpighi body of the cesophagus; the significa- 
tion of Herxheimer’s filaments.—P. Masson ; The endo- 
crinal gland of the intestine in man.—H. Bierry and 
Mlle. Lucie Fandard: The sugar of the blood plasma. 
—Ch. Dhéré: The photographic determination of the 
fluorescence spectra of the chlorophyll pigments.— 
Charles Lepierre: Zinc and Aspergillus. The experi- 
ments of M. Coupin and M. Javillier.—Em. Bourquelot 
and A. Aubry: The influence of the alcoholic strength 
on the biochemical synthesis of o-ethylglucoside and 
a-propylglucoside.—F. Garrigou: The utilisation of 
phreatic sheets by towns built on alluvial terraces of 
valleys.—Emile Haug: The zone of the Jurassic hills 
of Nans.—Alfred Angot: Value of the magnetic 
elements at the Val-Joyeux on January 1, 1914. 
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By Prof. W. M. 
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