of Mankind being thus most properly and truly the Seed of the Man. 6. The Analogy I have already mentioned, which we may rationally suppose between the manner of the propagation of Plants and Animals, does likewise make this probable. Every Herb and Tree bears its Seed after its kind; which Seed is nothing else but a little Plant of the same kind, which being thrown into the Earth, as into its _Uterus_, spreads forth its Roots, and receives its Nourishment, but has its form within its self, and we may rationally conjecture some such Analogy in the Propagation of Animals. The third Particular which later Discoveries make probable, is, that Animals cannot be formed of these _Animalcula_ without the _Ova in fœminis_, which are necessary for supplying of them with proper Nutriment: And this these Considerations seem to evince. 1. It is probable that an _Animalcle_ cannot come forward, if it do not fall into a proper _Nidus_. This we see is the _Cicatricula_ in Eggs; and tho' a Million of them should fall into an Egg, none of them would come forward, but what were in the Center of the _Cicatricula_; and perhaps the _Nidus_ necessary for their formation is so proportion'd to their bulk, that it can hardly contain more than one _Animalcle_; and this may be the reason why there are so few Monsters. This we see is absolutely necessary in _Oviparis_; and the only difference which seems to be between them and the _Vivipara_, in this matter, is in this, that in the latter the _Ova_ are properly nothing more but the _Cicatricula_, with its _Colliquamentum_, so that the _Fœtus_ must spread forth its Roots into the _Uterus_ to receive its nourishment; but the Eggs in _Oviparis_ may be properly term'd an _Uterus_, in relation to the _Fœtus_; for they contain not only the _Cicatricula_, with its _Amnion_ and the _Colliquamentum_, which is the immediate nourishment of the _Fœtus_, but also the materials which are to be converted into that _Colliquamentum_; so that the _Fœtus_ spreads forth its Roots no farther than into the White and Yolk of the Egg, from whence it derives all its nourishment. Now that an Animalcle cannot come forward without some such proper _Nidus_, Mr. _Leewenhoeck_ will not readily deny; for if there were nothing needful, but their being thrown into the _Uterus_, I do not see why many hundreds of them should not come forward at once; for as to what Mr. _Leewenhoeck_ says, that one of them would be-dwarf and choak the rest; this might fall out in process of time: But at first I do not see why many of them should not grow together, whilst scatter'd in so large a Field (and yet no such thing is observed) if there were not an absolute necessity of a _Cicatricula_ for their growth and thriving. Now, 2. That this _Cicatricula_ is not originally in _Utero_, seems evident from the frequent Conceptions which have been found _extra Uterum_: Such as the Child which continued Twenty six Years in the Woman of _Tholouse_'s Belly, mention'd _Numb._ 139.