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A bean-like form is taken; the nucleus divides, and a constriction is suddenly developed; this deepens; the opposite position of the flagella ensues, the nearly divided forms now vigorously pull in opposite directions, the constriction is thus deepened and the tail formed. The fiber of sarcode, to which the constricted part has by tension been reduced, now snaps, and two organisms go free.
These flagella, like bats' wings, are capable of being bent in only one direction, so that, in the course of their pendulum-like motion, in the movement one way the flagella are bent, while in the return movement they remain stiff, thus causing a current of water always flowing in one and the same direction.
The space occupied by the yolk corresponds to the archenteron or primitive digestive cavity; and the opening at the end to the primitive mouth or blastopore. Ectoderm and entoderm unite around the mouth. Both the blastosphere and gastrula often swim freely by flagella.
Many forms are motile some in virtue of fine thread-like flagella, and others through contractility of the protoplasm. The great majority multiply by simple fission, each parent cell giving rise to two daughter cells, and this process goes on with extraordinary rapidity. Other varieties, particularly bacilli, are propagated by the formation of spores.
The newly-fissioned form darted irregularly and rapidly for a brief space, then fixed itself to the floor or to a rigid object by the ends of its flagella, and, with its body motionless, an intense vibratory action was set up along the entire length of these exquisite fibers.
Give as a purgative Pill. coch. or Agaric; make nasalia of sage, or hyssop juice, betony, flagella, with one drop of oil of Elect. Dianth. Rosat. Diambrae, diamosci dulus, one drachm of each, and make lozenges to be taken every morning and evening. Auri Alexandrina, half a drachm at night on going to bed. If these things have no effect, try suffumigation and plasters, as they are prescribed above.
Now by doggedly following one of these through all its wanderings a wholly new phase in the morphology of the creature was revealed. This roughened or granular form seized upon and fastened itself to a form in the ordinary condition. The two swam freely together, both flagella being in action, but it was shortly palpable that the larger one was absorbing the lesser.
At the same moment a motion is set up which pulls the divided pairs asunder, making the interval of sarcode to grow constantly greater between them. During this time the nuclear body has commenced and continued a process of self-division; from this moment the organism grows rapidly rounder, the flagella swiftly diverge.
The next he drew towards him proved to be the seal of the Vice-Warden of the Grey Friars of Cambridge, a pointed one used about the year 1244, which to himself he declared, in heraldic language, to bear the device of "a cross raguly debruised by a spear, and a crown of thorns in bend dexter, and a sponge on a staff in bend sinister, between two threefold flagella in base" surely a formidable array of the instruments used in the Passion.
When the embryo has become partly developed, it detaches itself from the parent sponge, and, issuing from the oscula, propels itself through the water by means of a number of flagella. Silicious spicules next appear in its structure, and it then attaches itself to a rock and assumes its mature form.
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