The process is essentially a polar linear action, or differentiation from a common centre.
Petrunkevich (1901-1903), the second polar nucleus uniting with one daughter-nucleus of the first polar body gives rise to the germ-cells of the parthenogenetically-produced male.
This formation, one of the most widely spread in polar lands, though the most local in Greenland, is also the best known feature in its geology.
The prevailing winds in this region, which the sea traverses longitudinally, are westerly, but the sea itself causes the formation of bands of low barometric pressure during the winter season, within which cyclonic disturbances frequently develop, while in summer the region comes under the influence of the polar margin of the tropical high pressure belt.
The normal polarization at the zenith, as dependent upon the position of the sun, was the foundation of Sir C. Wheatstone's polar clock.
For purposes of measurement the polar boundaries are taken to be the Arctic and Antarctic circles, although in discussing the configuration and circulation it is impossible to adhere strictly to these limits.
The Atlantic anticyclone is, therefore, at its weakest in winter, and on its polar side the polar eddy becomes a trough of low pressure, extending roughly from Labrador to Iceland and Jan Mayen, and traversed by a constant succession of cyclones.
Also he showed that if such an antenna had its horizontal part swivelled round into various directions the current created in a distant receiver antenna varied with the azimuth, and when plotted out in the form of a polar curve gave a curve of a peculiar figure-of-8 shape.
Psychrophytes.These include the plants which grow on the lv ild soils of subniveal and polar districts.
+1~ ii 1n a, Antipodal cell; sp, polar nuclei; eing e sma er.
In all cases of polar nuclei.
He proved conclusively that any southern continent that might exist lay under the polar ice.
Polar bodies were first observed in the eggs of Hexapoda by F.
There is no reunion of the second polar nucleus with the female pronucleus, but, according to the recent work of L.
From this point a large area of open water was seen which was believed to be an "open Polar Sea," a chimera which played an important and delusive role in subsequent explorations.
Its cartesian equation, when the line joining the two fixed points is the axis of x and the middle point of this line is the origin, is (x 2 + y 2)2 = 2a 2 (x 2 - y 2) and the polar equation is r 2 = 2a 2 cos 20.
Coradi's " Polar Planimeter," one of the most trustworthy instruments of the kind.'
On the original only equator, ecliptics, tropics, polar circles and one meridian 80° to the west of Lisbon are laid down.
If they be reckoned as integral parts of Greenland, then the north coast, fronting the polar sea, culminates about 83° 40' N.
Davis, Polaris (Hall's) North Polar Expedition (Washington, 1876).
In the polar areas the melting of sea-ice and of ice formed by precipitation lowers the density of the seawater and causes a difference of level which sets up streaming movements towards the equator.
There will be great outbursts of polar ice, but this will melt at higher latitudes than in the periods when the tide-generating force is minimal.
It has been suggested, however, that a prolonged period of volcanic activity may reduce the air temperature to a marked degree by throwing large quantities of dust into the atmosphere: this will act by preventing the penetration of solar radiation.) During a period of prolonged glaciation water becomes withdrawn from the ocean, for rainfall goes to form solid ice-caps that accumulate upon polar and continental land areas.
At the polar meteorological station of Sagastyr, in the delta of the Lena (73° 23' N.), the following average temperatures have been observed: January - 34.3° F.
The following species, none of which are found in European Russia, are characteristic of the tundras - arbutus (Arctostaphilus alpina), heaths or andomedas (Cassiope tetragona and C. hypnoides), Phyllodoce taxifolia, Loiseleuria procumbens, a species of Latifolium, a Polar azalea (Osmothamnus fragrans) and a Polar willow (Salix arctica).
The ï¿½th polar of ax with regard to y is n-ï¿½ a aye i.e.
Runs mathematically straight and points almost absolutely true for the Polar star.
On the polar side of the high-pressure area a west wind drift is under the control of the " roaring forties," and on reaching South Africa part of this is deflected and sent northwards along the west coast as the cold Benguella current which rejoins the equatorial.
Nature and mind (which are the two sides, or polar directions, of the one absolute) are each viewed as an activity advancing by an uninterrupted succession of stages.
A depression surrounds the little-known south polar region in a continuous ring and extends northwards in three vast hollows lying between the arms of the elevated area.
It appears that in parthenogenetic eggs two polar nuclei are formed.
When the warmer interglacial periods recurred the polar and continental ice-caps melted and the sea-level became raised again - that is, there was submergence of the eroded plateaux formed as indicated above.
Valuable fur is obtained from the white and blue fox, the skin of the eider-duck and the polar bear.
Generally from to 24 gores and two small segments for the polar regions printed on vellum paper are used for each globe.