They are soft and lustrous, with a peculiarly smooth feel, and though often confounded with mica-schists may be distinguished by their richness in magnesia; many of them contain tremolite or actinolite; others have residual grains of olivine or augite; and here also every gradation can be found between the unmodified igneous types and the perfectly metamorphic schists.
The barium and magnesium salts of this acid are formed when baryta and magnesia are fused with cobalt sesquioxide.
Although the authenticity of the three speeches mentioned above is generally admitted, Demetrius of Magnesia doubted that of the speech Against Demosthenes, while A.
With immigrants called together from all Greece, as we learn from a psephisma passed by "boule and demos" of this town in 206 in honour of Magnesia on the Maeander (Kern, Inschriften von Magnesia am Maeander, No.
To Themistocles to provide him with wine, as Percote did with meat and Magnesia with bread.
Wiegand and Schrader in 1895-1898 have laid bare the site of the Greek Priene, and the same has been done for the remains of Magnesia ad Maeandrum by French excavators in 1842-1843 and the German expedition under K.
Cornelius Scipio at Magnesia ad Sipylum (190), following on the defeat of Hannibal at sea off Side, gave Asia Minor into their hands.
The average of a large number of analyses of Upland cotton seed gives the following figures for its fertilizing constituents: - Nitrogen, 3.07%; phosphoric acid, 1.02%; potash, 1.17%; besides small amounts of lime, magnesia and other valuable but less important ingredients.
In a scientific definition the compounds of fatty acids with basic metallic oxides, lime, magnesia, lead oxide, &c., should also be included under soap; but, as these compounds are insoluble in water, while the very essence of a soap in its industrial relations is solubility, it is better to speak of the insoluble compounds as " plasters, " limiting the name " soap " as the compounds of fatty acids with soda and potash.
4 The following are the symbols employed by Dalton: which represent in order, hydrogen, nitrogen, carbon, oxygen, phosphorus, sulphur, magnesia, lime, soda, potash, strontia, baryta, mercury; iron, zinc, copper, lead, silver, platinum, and gold were represented by circles enclosing the initial letter of the element.
High percentage of silica, low iron, lime and magnesia, and a considerable amount of potash and soda).
It is also obtained by passing chlorine into a suspension of lead oxide or carbonate, or of magnesia and lead sulphate, in water; or by treating the sesquioxide or red oxide with nitric acid.
It is to be distinguished from an archaic figure still visible, carved in the northern side of the mountain near Magnesia, to which tradition has given the name of Niobe, but which is really intended for Cybele.
Ore endowed with this curious property was well known to the ancient Greeks and Romans, who, because it occurred plentifully in the district of Magnesia near the Aegean coast, gave it the name of magnes, or the Magnesian stone.
Mineral waters (with magnesia, soda-lithia and alum) issue from several springs, some at a temperature as high as 106° F., and are used both for drinking and for bathing.
One of these he says is found in magnesia, is white in colour, does not attract iron and is like pumice stone.
This large proportion of magnesia undoubtedly supplied the stability required to withstand the process of enamelling.
Phys., 1897, (7) 12, p. 153) by heating silica with magnesium in the presence of magnesia, or by heating silica with aluminium.
Loew, who prepared in 1885 a sweet, unfermentable syrup, which he named formose, C6H120e and, later, by using magnesia instead of lime, he obtained the fermentable methose.
In the ordinary chemical analyses of the soil determinations are made of the nitrogen and various carbonates present as well as of the amount of phosphoric acid, potash, soda, magnesia and other components soluble in strong hydrochloric acid.
The presence of a base such as lime or magnesia (or their carbonates) is also essential, as well as an adequate degree of moisture: in dry soils nitrification ceases.
When prolonged heating is required at very high temperatures it is found necessary to line the furnace-cavity with alternate layers of magnesia and carbon, taking care that the lamina next to the lime is of magnesia; if this were not done the lime in contact with the carbon crucible would form calcium carbide and would slag down, but magnesia does not yield a carbide in this way.
Taking magnesia alba, which he distinguished from limestone with which it had previously been confused, he showed that on being heated it lost weight owing to the escape of this fixed air (named carbonic acid by Lavoisier in 1781), and that the weight was regained when the calcined product was made to reabsorb the fixed air with which it had parted.
These investigations, by which Black not only gave a great impetus to the chemistry of gases by clearly indicating the exi stence of a gas distinct from common air, but also anticipated La voisier and modern chemistry by his appeal to the balance, were described in the thesis De humore acido a cibis orto, et magnesia alba, which he presented for his doctor's degree in°1754; and a fuller account of them was read before the Medical Society of Edinburgh in June 1755, and published in the following year as Experiments upon magnesia, quicklime and some other alkaline substances.
This battle made Philip tagus of Thessaly, and he claimed as his own Magnesia, with the important harbour of Pagasae.
Filtration in the chemical laboratory is commonly effected by the aid of a special kind of unsized paper, which in the more expensive varieties is practically pure cellulose, impurities like feric oxide, alumina, lime, magnesia and silica having been removed by treatment with hydrochloric and hydrofluoric acids.
Another genealogy makes him the son of Poseidon and Arne, granddaughter of Hippotes, and a descendant of Aeolus, king of Magnesia in Thessaly, the mythical ancestor of the tribe of the Aeolians (Diodorus iv.
SALMONEUS, in Greek mythology, son of Aeolus (king of Magnesia in Thessaly, the mythic ancestor of the Aeolian race), grandson of Hellen and brother of Sisyphus.
MAGNESIA, in ancient geography the name of two cities in Asia Minor and of a district in eastern Thessaly, lying between the Vale of Tempe and the Pagasaean Gulf.
(I) Magnesia Ad Maeandrum, a city of Ionia, situated on a small stream flowing into the Maeander, 15 Roman miles from Miletus and rather less from Ephesus.
According to tradition, reinforced by the similarity of names, it was founded by colonists from the Thessalian tribe of the Magnetes, with whom were associated, according to Strabo, some Cretan settlers (Magnesia retained a connexion with Crete, as inscriptions found there attest).
The railway runs right through the precinct, and much of Magnesia has gone into its bridges and embankments.
Magnesia continued under the kings of Pergamum to be one of the most flourishing cities in this part of Asia; it resisted Mithradates in 87 B.C., and was rewarded with civic freedom by Sulla; but it appears to have greatly declined under the Roman empire, and its name disappears from history, though on coins of the time of Gordian it still claimed to be the seventh city of Asia.
Haumann, Magnesia am Maeander (1904).
(2) MAGNESIA AD SIPYLUM (mod.
Euboea at the present time produces a large amount of grain, and its mineral wealth is also considerable, great quantities of magnesia and lignite being exported.
Valentin prepared magnesia alba from the mother liquors obtained in the manufacture of nitre.
Magnesia was confounded with lime until 1755, when J.
Neville), and boils at about lioo C. Magnesium and its salts are diamagnetic. It burns brilliantly when heated in air or oxygen, or even in carbon dioxide, emitting a brilliant white light and leaving a residue of magnesia, MgO.
Magnesium Oxide, magnesia, MgO, occurs native as the mineral periclase, and is formed when magnesium burns in air; it may also be prepared by the gentle ignition of the hydroxide or carbonate.
A strong solution of the chloride made into a thick paste with calcined magnesia sets in a few hours to a hard, stone-like mass, which contains an oxychloride of varying composition.
Magnesium oxychloride when heated to redness in a current of air evolves a mixture of hydrochloric acid and chlorine and leaves a residue of magnesia, a reaction which is employed in the Weldon-Pechiney and Mond processes for the manufacture of chlorine.
Magnesia alba, a white bulky precipitate obtained by adding sodium carbonate to Epsom salts,is a mixture of Mg(CO 3 H) (OH) 2H 2 O,Mg(CO 3 H) (OH) and Mg(OH) 2.
Magnesium sulphide, MgS, may be obtained, mixed with some unaltered metal and some magnesia, as a hard brown mass by heating magnesia, in sulphur vapour.
There Antiochus the Great collected the army with which he met the Romans at Magnesia, and there two years later the treaty between Rome and the Seleucid realm was signed.
With this pile he decomposed sulphate of magnesia (first letter to Abbott, July 12, 1812).
The matter was carefully investigated, and it was found that the sulphate of magnesia in the sea-water has a decomposing action on Portland cements, especially those which contain a large proportion of lime or even of alumina.
In order that the slag shall have these properties its composition usually lies between the following limits: silica, 26 to 35%; lime, plus I 4 times the magnesia, 45 to 55%; alumina, 5 to 20%.
The usual composition of this slag is iron oxide, i o to 16%; lime, 40 to 50%; magnesia, 5%; silica, 6 to 9%; phosphoric acid, 16 to 20%.
The lining of the converter is made of 90% of the mixture of lime and magnesia which results from calcining dolomite, (Ca,Mg)CO i, at a very high temperature, and 10% of coal tar freed from its water by heating.
With a deposit of Epsom salts (sulphate of magnesia), 7 ft.
While the proportion of common salt to sulphate of magnesia is as r r to r in the water of the Black Sea and as 2 to 1 in the Caspian water generally, it is as 12.8 to 5.03 in the Kara-boghaz.
The citizen body had been increased some generations before by colonists from Magnesia-onMeander sent at the invitation of Antiochus I.
Magnesia, p. 171 f.).
Many of the Egyptian rocks in the desert areas and at the cataracts are coated with a highly polished film, of almost microscopic thinness, consisting chiefly of oxides of iron and manganese with salts of magnesia and lime.
The remaining silicates and aluminates present, and ferric oxide and magnesia, if existing in the moderate quantities which are usual in Portland cement of good quality, are of minor importance and may be regarded as little more than impurities.
Texier with the great cairn beneath Old Magnesia; but Sir W.
Salt is added in the roasting to convert any lime, magnesia or lead which may be present, into the corresponding chlorides.