The white ruff on the neck, and the similarly coloured feathers of the wing, do not appear until the completion of the first moulting.
Ruff (Ber., 18 9 8, 3 1, p. 457) from nitro-di-isobutyl by reducing it to the corresponding hydroxylamino compound with aluminium amalgam and oxidizing this with chromic acid mixture.
The breeding-grounds of the ruff extend from Great Britain across N.
Ruff and Curt Albert (Ber., 1905, 38, p. 53) by decomposing titanium fluoride with silicon chloroform in sealed vessels at 100 -120° C. It is a colourless gas which may be condensed to a liquid boiling at -80 2° C. On solidification it melts at about -110° C. The gas is very unstable, decomposing slowly, even at ordinary temperatures, into hydrogen,, silicon fluoride and silicon: 4SiHF 3 =2H 2 +3SiF 4 +Si.
Ruff effects the same change by oxidizing the sugar to the oxy-acid, ' See Fermentation; and for the relation of this property to structure see Stereoisomerism.
Four active tetroses are possible, and three have been obtained by Ruff and Wohl from the pentoses.
557.) Titanium fluoride, TiF 4, is a fuming colourless liquid boiling at 284°, obtained by distilling a mixture of titanium oxide, fluorspar and sulphuric acid; by heating barium titanofluoride, BaTiF6 (Emrich, Monats., 1904, 25, p. 907); and by the action of dry hydrofluoric acid on the chloride (Ruff and Plato, Ber., 1904, 37, p. 673).
RUFF, a bird so called from the very beautiful and remarkable frill of elongated feathers that, just before the breedingseason, grow thickly round the neck of the male, who is considerably larger than the female, known as the reeve.
From each side of his head sprouts a tuft of stiff curled feathers, while the feathers of the throat change colour, and beneath and around it sprouts the frill or ruff already mentioned as giving the bird his name.
Bartlett, that every ruff assumes tufts and frill exactly the same in colour and markings as those he wore in the preceding season; and thus, polymorphic as is the male as a species, as an individual he is unchangeable.
2 This "ruff" has been compared to that of Elizabethan or Jacobean costume, but it is essentially different, since that was open in front and widest and most projecting behind, whereas the bird's decorative apparel is most developed in front and at the sides and scarcely exists behind.
The ruff also occasionally visits Iceland, and there are several well-authenticated records of its occurrence on the E.
On heating it melts at 95.6° (Bunsen) to a liquid resembling mercury, and boils at 877.5° (Ruff and Johannsen, Ber., 1905, 38, p. 3601), yielding a vapour, colourless in thin layers but a peculiar purple, with a greenish fluorescence, when viewed through thick layers.
Ruff and Curt Albert, Ber., 1905, 38, p. 2222).
Thus Wohl prepared l-threose from l-xylose and l-erythrose from l-arabinose, and Ruff obtained d- and l-erythrose from d- and l-arabonic acids, the oxidation products of d- and l-arabinoses.
That all this wonderful "show" is the consequence of the polygamous habit of the ruff can scarcely be doubted.
Ruff and W.
The hexafluoride, WF 6, is a very active gaseous compound, which attacks glass and metals, obtained from tungsten hexachloride and hydrofluoric acid (Ruff and Eisner, Ber., 1905, 38, p. 74 2).
By heating freshly prepared red ferric hydrate with water under 5000 atmospheres pressure Ruff (Ber., 1901, 34, p. 34 1 7) obtained definite hydrates corresponding to the minerals limonite (30°-42, 5°), gothite (4 2.5°-62, 5°), and hydrohaematite (above 62.5°).
On cooling it solidifies to a crystalline mass which fuses at - 80° C. (Ruff, ibid.).
It is a colourless fuming liquid which boils at 152-153° C. When heated under pressure it decomposes, forming sulphuric acid, sulphuryl chloride, &c. (Ruff, Ber., 1901, 34, p. 35 0 9).
Ruff, Ber., 1907, 41, p. 373 8).
Neither of these processes admitted of commercial application, but by a modification of Ruff and Plato's process, W.
Ruff and 0.
Birds, 3d ed., p. 346), as follows: "The ruff, like other fine gentlemen, takes much more trouble with his courtship than with his duties as a husband.
Ruff and E.
Ruff and Fischer (Ber., 1903, 36, p. 418) did not appear to exist, but E.