Harvey makes another error in speaking of an abortion in the second month, where the mass was as large as a pigeon's egg, but without any foetus regularly formed; whereas, it is maintained by Ruysch, and many other anatomists, that the foetus is perceptible, even to the naked eye, in the first month. The History of the Academy mentions a foetus, that was completely formed in twenty-one days after impregnation. If to these authorities we add that of Malpighius, who perceived the chicken in the cicatrice, immediately after the egg was laid by the hen, we cannot doubt, but that the foetus is formed immediately after copulation; consequently, we must not pay any credit to what Harvey says on the parts increasing one after the other by juxta-position, since they are all existent from the first, and gradually expand until the whole is complete. De Graaf took the acceptation of the word egg in a quite different light to Harvey: he insists that the testicles of women were true ovaries, and contain eggs like those of oviparous, animals, only that they are much smaller, do not quit the body, and are never detached till after impregnation, when they descend from the ovary into the horns of the matrix. The experiments of De Graaf have contributed most to establish the existence of these pretended eggs, which yet is not at all founded; for this famous anatomist is deceived, first, by mistaking the vesicles of the ovarium for eggs, whereas they are inseparable from it, form parts of its substance, and are filled with a kind of lymph. Secondly, he is also deceived when he considers the glandular bodies to be the covering of those eggs, or vesicles; for it is certain, by Malpighius's, Valisnieri's, and my own observations, that the glandular bodies neither surround nor contain one of those vesicles. Thirdly, he is deceived still more when he supposes the glandular body is never formed till after fecundation; as they are invariably found in every female who has attained the age of puberty. Fourthly, he is no less deceived when he believes that the globules which he saw in the matrix, and which contained the foetuses, ware the same vesicles, or eggs, which had fallen from the ovariam, and which, he remarks, were become ten times smaller than they were in the ovary. This remark alone, one would imagine, Should have made him perceive his error. Fifthly, he is wrong in saying that the glandular bodies are only the coverings of the fecundated eggs, and that the number of coverings, or empty follicles, always answer to the number of foetuses. This assertion is entirely contrary to truth: for on the testicles of all females we find a greater number of glandular bodies, or cicatrices, than there are productions of foetuses, and they are also found in those which have never brought forth. To this we may add, that neither he, Verheyen, nor any other person, have ever seen these eggs, much less these pretended coverings, on which they have, notwithstanding,