The Seed of a Man being syring’d into the Privy Parts of a Woman by the Yard, it repairs to the bottom of the Womb, and its inner Orifice shuts it self close: ‘After which the Seed being embrac’d and press’d by the Womb, all its Particles begin to take their respective Posts; the subtilest continue in the Center, and consequently the grosser and superfluous Parts are thrust towards the Surface, where they produce the After-birth, the Navel-string, and the Membranes, in which the _Fœtus_ is wrapt. In the mean time all the Particles calculated for forming the different parts of the Body, disengage themselves by the force of their motion, and either part or join according to their mutual Disparity or Conformity; so that those design’d for the head Assemble in the place where they ought to be; and those for the rest of the Body do the like: And at the same time among those calculated for the Head, the Particles qualify’d for forming the Eyes, Ears, _&c._ rendezvous in their proper places: The same may be said of the Particles of which the Breast, Belly, and Limbs are compos’d. The Form, Structure, Order and Connection of all these parts, depends chiefly upon the Spirit enclos’d within the Seed; which by the meer necessity of its Motions, and without any Knowledge or Understanding, unravels the _Chaos_ where the Particles lay confus’d, and ranks them in the same Order, that they had when lodg’d in the Body of the Animals, from which they sprung. The parts of the _Fœtus_ being thus form’d, the subtilest part of the Spirit continues in the Center of the new-form’d Body, _i. e._ the Heart; and there makes a sort of Fire without Light (being the natural Heat that gives Life) which is fed by the circular motion of the Blood that passes there incessantly.’ This is the most probable _Idea_ of forming the _Fœtus_, and what passes in the Womb, that is given by any Ancient or Modern Writers. Some are of Opinion, that the _Fœtus_ is form’d of a mixture of the Male and Female Seed; and that these two Seeds impregnated with the Spirit of Life, are the agent and matter of _Generation_. Some alledge that the Male Seed is sufficient of it self to form a _Fœtus_; and that the Woman only gives it a lodging, and furnishes the necessary Blood for its nourishment in the Womb: The Male being in this sense, look’d upon as an accomplish’d and perfect piece of Work, and the Female only a fertile Ground, which produces good Seed where the Labourer sows it well: And others are of opinion, that the Woman’s Seed contains the first, and the true Model of the _Fœtus_; there being small seminal Vesicles in the Testicles of a Woman, call’d the Eggs; which contain within themselves, all that is necessary to give the _Fœtus_ a Being.