70 Chemical Notices from Foreign Sources. 3 CL Haw,
plants and the atmosphere. Yet these latter seem to me in studying the a@ion of carbonic acid upon albumen he
the more important, the smallness of the effects being finds that upon heating ordinary white of egg in a
compensated by their duration and by the extent of the vacuum at 30° to 35° it gradually assumes a gelatinous
surfaces influenced. texture, and is Ernabrmed fio very hard Abreos Jods,
iffe. — having a great resemblance to the flocks of bloo rin,
tle@tro-metallurgy of Cobalt. —A. Gaiffe.— The M. Seibatem on his own behalf and on that of M.
Keane as hese sesh wa ig beauty of worl galva Kourbatoff, mentions that on causing ammonium sul
nical eposited as well as by its hardness. is no 3 » : Stn 2
oxidised The iron, and much less care is required to keep phide to 20 os Syrameine A I dichlor.
its surface in good condition. Its beautiful white colour A Beis apn he dnining Se eRe
will make it suitable for the decoration of other metals, +. rw ein a A 3 ‘ The lat
The bath used was a neutral solution of the double sul. 2f M. Erémine cn the Prparation © ozone. id x is
phate of ammonia and cobalt, which does not require nearly Bnd tal gn bi ra Saition oO 2 ic ays 8 ore
80 much care as the nickel baths. The anode pay bes to be more stable in the light than in darkness. For
sheet of platinum, or betar a plate of potslt, githey ot coating the corks and joints needful in the preparation of
or forged. To obtain a white and adhesive degosly the vzone The author recommends the following mixtures :—
or ought @ Ie regnlated 8 te utah 3 J ysis of For the corks a mixture of paraffin, wax, and rosin, and
electro-motor force of the standar e i - = £ h s :
ciation, and be brought to 3 units only when the entire 2 fr jinn or lutes re fF eerin 30d gelatin.
surface of the article to be coated has become white. on the ApRer Foes an a Font de of lead on the combina.
Reform of Certain Analytical Processes Employed tions of hydrocarbides of the series CnHay with the
in the Laboratories of Agricultural Stations and of halgens,
Observatories of Chemical Meteorology. = Volu- "p's Wagner also described the investigations of M.
metric Determination of the Sulphates in Waters. — yp jj; upon the nitrophthalic acids. The author gave a
A. Houzeau.—The process brought forward is simpleand 30.) 4 description of the preparation, properties, and
sufficiently precise. Qualities obtained by introducing separation of the two nitrophthalic acids formed by the
into the volumetric method three new features :—(1.) The action of nitric upon phthalic acid. The new nitro.
use of the * drop-counter” in place of the graduated phthalic acid, which the author names isonitrophthalic
burette. (2.) The evaluation of time in the accompligh- acid, melts at 1609, whilst the melting-point of the other
ment of the chemical readion. (3.) The substitution of 204° to 206°,
an empirical equivalent for the theoretic equivalent in M. Mendeleef on behalf of E. Scheene described the
the relation between the precipitant and the substance qo." hydrogen peroxide upon the oxy compounds of
precipitated. One centilitre of water is poured into a test. thallium. "Whether in solution or in the gaseous state
tube x20 m.m. in, length and 18 m.m. in diameter, and a it converts thallous oxide into a brown oxide insoluble in
drop of acetic acid is added. , There are poured then by water. The brown colouration of ozonoscopic paper immeans
 of a ‘““drop-counter” with a greased orifice pregnated with thallium cannot, therefore, serve as proof
(25 drops to x c.c.) 2, 4, 6, 8, or to drops of a Standard _¢ the presence of ozone in the atmosphere in which the
solution of chloride of barium, Sontaining per lire po fas previously demonstrated the presence of hydric
305 grms. BaClz2HO. After waiting 3 minutes, if a peroxide.
turbidity has been formed, the liquid is poured upona ° M. Wreden announces that he has converted ordinary
single or double paper filter, previously moistened and camphor into a liquid isomer by the action of dilute
drained, and of a capacity of about r2 c.c. The filtrate, hydrochloric acid at 190°. The new compound boils at
which ought to be perfectly bright if the paper is of good 1870 to 193°. Its sp. gr. =0913, and it does not crystalquality,
 is received in a test-tube similar to the foregoing. ise at a temperature of — ro, !
One drop or more of the barytic solution is then poured M. Rudneff made a preliminary communication on the
in, and after the lapse of three minutes if a turbidity trimethyl-carbinamin obtained by M. Boutlerow as a
appears the liquid is thrown upon the same unwashed secondary product of the preparation of trimethyl-acetic
filter. The addition of the reagent is thus continued, acid
and the filtration until the last drops of barium chloride M. Kaschirsky communicated the results of his re.
no longer causes any cloudiness in the liquid in the Space ches on the ation of zinc-methyl upon the bromof
 three minutes. The advantage of the drop-counter is anhydrides of the saturated mono-bromated fatty acids
that it enables two or three determinations to be made of the series a.
simultaneously upon _different samples of water with a ™ Menchoutkine announces that the researches on the
single instrument. Two determinations of sulphate MAY etherification of the primary and secondary alcohols which
thus be made in less than half an hour. he had previously communicated to the Society contains
Specific Gravities of Solutions of Pure Sugar.—M. errors which will necessitate further experiments. It is
Barbet.—A table showing the theoretic and experimental  (g be remarked that at present the limit of the ethylacetic
weight per litre, with the increase of weight for every system, according to these new researches, coincides with
percentage of sugar from 1 to go. that given by M. Berthelot.
Determination of Manganese in Irons, Cast-irons,
_ and Steels; in Spiegel, Ferromanganese, and Ores.
—M. Deshays.—When to a nitric or nitrosulphuric solution
 of manganese there is added a certain quantity of
plumbic dinoxide there is immediately produced a violetred
 colouration, varying in intensity and in tone accordng
 to the quantity of manganese contained in the acid
liquor. In all cases the colouration is so much the
stronger as the quantity of manganese is more consider.
able, but it is still perceptible, even in case of extremely
minute quantities. The tone varies according as the
liquid contains nitric acid alone or a mixture of nitric and
sulphuric, according to the degree of oxidation of the
manganese, and also according to its origin. Thus, when
employing the plumbic acid reaction for the qualitative
dete®ion of manganese in cast-irons and ores, we may
have tones varying from the red of an onion skin to a

Bulletin de la Societe Chimique de Payis,
No. 12, June 20, 1878.
Synthesis of Cyan-acetyl.ureas and of Murexoin,
E. Mulder.—The author obtains cyan-acetyl-urea on
treating the chloride of cyan-acetyl with urea. It represents
 a derivative in which three atoms of carbon are
successively united with a residue of urea, as is the case
with barbituric acid. Cyan-acetyl-dimethyl-urea is produced
 by the adion of the chloride of cyan-acetyl upon
dimethyl-urea. If treated with a small quantity of nitric
acid of sp. gr, 1'2 this urea gives rise to the formation of
Rcompound of a fine purple-red colour, which is murexoin.,
Russian Chemical Society. Session April 6/18, 1858.
—M. Setschinoff announces, in order to take date, that