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Anything laid on the surface of the viscid drop, the spherule of clear, glairy liquid which it secretes, produces no effect unless it sinks through to the gland; or unless the substance is soluble and reaches it in solution, which, in the case of certain substances, has the same effect. But the glands themselves do not move, nor does any neighboring portion of the tentacle.
It is supposed to be of chemical origin, each spherule being an aggregation of particles round a central nucleus. The oolite system is largely developed in England, France, Westphalia, and Northern Italy; it appears in Northern India and Africa, and patches of it exist in Scotland, and in the vale of the Mississippi. It may of course be yet discovered in many other parts of the world.
This primitive form in the upper convex part was a structure of contiguous globules or spherules, and each spherule was a joining together of those more minute, and each of these in like manner of those most minute. It was thus of three degrees. In front, in the flat part, a kind of delineation appeared for a face.
He loved the sparrow especially, for Catullus' sake. His gigantic personality impressed all who met him. Conversation with him reduced the world from a sphere to a spherule. It shrank steadily he had traversed so much of it, and he talked about out-of-the-way places so familiarly.
Magnified 3 diameters. In the upper part of the Mountain Limestone group in the south-west of England, near Bristol, limestones having a distinct oolitic structure alternate with shales. In these rocks the nucleus of every minute spherule is seen, under the microscope, to consist of a small rhizopod or foraminifer. Classification of the Old Red Sandstone in Scotland and in Devonshire.
What can be more widely contrasted than a newly-born child and the small, semi-transparent spherule constituting the human ovum? The infant is so complex in structure that a cyclopædia is needed to describe its constituent parts. The germinal vesicle is so simple that it may be defined in a line.