+1~ ii 1n a, Antipodal cell; sp, polar nuclei; eing e sma er.
A striking fact in the configuration of the crust is cs 1'000 n that each continent, or elevated mass of the crust, is T diametrically opposite to an ocean basin or great de 5000 0 -5000 -15000 -20 2500 -300 pression; the only partial exception being in the case of southern South America, which is antipodal to eastern Asia.
The " tetrahedral theory " brought forward by Lowthian Green,' that the form of the earth is a spheroid based on a regular tetrahedron, is more serviceable, because it accounts for three very interesting facts of the terrestrial plan - (1) the antipodal position of continents and ocean basins; (2) the tri angular outline of the continents; and (3) the excess of sea in the southern hemisphere.
The three cells at the opposite end are known as antipodal cells and become invested with a cell-wall.
The antipodal cells aid more or less in the process of nutrition of the developing embryo, and may undergo multiplication, though they ultimately disintegrate, as do also the synergidae.