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He seemed cordially delighted to patronize the son; he invited me to visit him at Laughton, and hinted to my father that I was formed for something better than a counting-house: my poor father was intoxicated. In a word, here I am; here, often for days, almost weeks, together, have I been a guest, always welcomed." "You pause. This is the primordium, now comes the confession, eh?"
Harvey calls a "primordium," a pre-existing vital germ or unit or whether it originates de novo, as the materialists assert, from infusions contained in their experimental flasks, or from plastide particles contained in protoplasmic matter, or from the still more daring hypothesis of "molecular machinery" as worked by molecular force?
I conceive the primordium, or rudiment of the embryon, as secreted from the blood of the parent, to consist of a simple living filament as a muscular fibre; which I suppose to be an extremity of a nerve of loco-motion, as a fibre of the retina is an extremity of a nerve of sensation; as for instance one of the fibrils, which compose the mouth of an absorbent vessel; I suppose this living filament, of whatever form it may be, whether sphere, cube, or cylinder, to be endued with the capability of being excited into action by certain kinds of stimulus.
After careful search through the "Exercitationes de Generatione," the most that appears clear to me is, that Harvey believed all animals and plants to spring from what he terms a "primordium vegetale," a phrase which may nowadays be rendered "a vegetative germ"; and this, he says, is "oviforme," or "egg-like"; not, he is careful to add, that it necessarily has the shape of an egg, but because it has the constitution and nature of one.
Palingenesie Philosophique, part X. chap. But, thus defined, the germ is neither more nor less than the "particula genitalis" of Aristotle, or the "primordium vegetale" or "ovum" of Harvey; and the "evolution" of such a germ would not be distinguishable from "epigenesis."
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