of the _Philos. Trans._ And the little _Fœtus_ found in the _Abdomen de St. Mere_, together with the Testicle torn and full of clotted Blood, recorded _Numb._ 150. both taken out of the Journals _des Savans_: Such also seem to be the _Fœtus_ in the _Abdomen_ of the Woman of _Copenhagen_, mention'd in the _Nouvelles des Lettres_, for _Sept._ 85. _pag._ 996. all the Members of which were easily to be felt through the Skin of the Belly, and which she had carried in her Belly for four Years; and the seven Years Gravidation, related by Dr. _Cole_, _Numb._ 172. of the _Transact._ That these two were undoubtedly _extra Uterum_, is uncertain, because the last was not open'd after her death, and the former may be yet still alive. Now granting once the necessity of a proper _Nidus_, for the formation of an Animalcle into the Animal of its respective kind; these Observations make it probable, that the _Testes_ are the _Ovaria_ appropriated for this use; for tho' the Animalcles coming thither in such Cases may seem to be extraordinary, and that usually the Impregnation is in _Utero_; yet it may be collected from hence, that the _Cicatriculæ_ or _Ova_ to be impregnated, are in _Testibus fœmineis_; for if it were not so, the accidental coming of Animalcles thither could not make them come forward more than in any other part of the Body, since they cannot be formed and nourished without a proper _Nidus_. But 3. It is acknowledg'd by all, that the _Fœtus in Utero_, for some considerable time after Conception, has no connexion with the Womb, that it sits wholly loose to it, and is perfectly a little round Egg with the _Fœtus_ in the midst, which sends forth its Umbilical Vessels by degrees, and at last lays hold on the _Uterus_. Now from hence it seems evident, that the _Cicatricula_, which is the Fountain of the Animalcles nourishment, does not sprout from the _Uterus_, but has its _Origin_ elsewhere, and falls in thither as into a fit Soil, from whence it may draw Nutriment for the growth of the _Fœtus_, else it cannot be easily imagin'd, how it should not have an immediate Connexion with the _Uterus_ from the time of Conception. If you join all these three Considerations together, _viz._ that an _Animalcle_ cannot come forward without a proper _Nidus_ or _Cicatricula_; that there have been frequent _Fœtus's extra Uterum_; and that they have no _Adhæsion_ to the _Uterus_, for a considerable time after Conception, they seem to make it evident, that Animals cannot be form'd _ex Animalculis_ without the _Ova in Fœminis_. To all these I shall subjoin the Proposal of an _Experimentum Crucis_, which may seem to determine, whether the _Testes Fœmineæ_ be truly the _Ovaria_, _viz._ Open the _Abdomen_ of the Females of some kinds, and cut out these Testicles, and this will determine, whether they be absolutely necessary for the formation of Animals.