When this is the case the gathering is carried to a block or half-open mould in which it is rolled and blown until it acquires, roughly, the shape of a hemisphere, the flat side being towards the pipe and the convexity away from it; the diameter of this hemisphere is so regulated as to be approximately that of the cylinder which is next to be formed of the viscous mass.
No tribe is confined to one hemisphere and no large genus to any one floral region; facts which indicate that the separation of the tribes goes back to very ancient times.
This process, in effect, leaves each orifice surrounded by a hemisphere of coarse sand across which the water flows with comparative freedom from a larger hemisphere where the corresponding velocity is very slow, and where the presence of finer and more obstructive particles is therefore unimportant.
Again, the mass-centre of a uniform solid right circular cone divides the axis in the ratio 3: I; that of a uniform solid hemisphere divides the axial radius in the ratio 3: 5.
Certain species of the southern hemisphere genus Dacrydium afford particularly striking instances of heterophylly, e.g.
The foot now protrudes below the mouth, and the post-oral hemisphere of the trochosphere grows more rapidly then the anterior or velar area.
His regional commanders were the only two people in the world who would challenge him: the cold master assassin in charge of the western hemisphere and the warm master negotiator in charge of the eastern hemisphere.
The Pan-American Exposition, in celebration of the progress of the Western hemisphere in the nineteenth century, was held there (May 1-November 2, 1901).
Though now on the way to extinction, Cycadeae are still widely represented in the southern hemisphere by genera which, however, have no counterpart in the Mesozoic era.
In the southern hemisphere there is comparatively little inhabited land in high latitudes and observational data are few; thus little is known as to how the frequency varies with latitude and longitude.