Now since he absolutely declares, they who think thus are without Reason, it follows that _Lemnius_ had no right to quote him, for the only Opinion he dislikes, of those contained in the whole Chapter; but to whomsoever the Opinion belongs, there is a Necessity for the following Animadversions upon it. If a limited Time was necessary thus for the procreating of the different Sexes, as, that for the first five Days after the Cessation of the menstrual Discharge, Males only are begotten, it should have been universally known by Experience long ago, since the Opinion was as early as _Avicenna_; and none of those that we daily see very anxious for Male Heirs, would ever want them, if their Consorts were breeding Women, and this the Case. Again, no Lady that languishes for a little Daughter amongst her Sons, would be long in Pain about it, if she could by Coition at any certain Time be capable of chusing one; nor in fine, would any such Appearance happen in human Nature, as is erroneously reputed Hermaphrodital, if such were never produced, but after the twelfth Day from those times of the Menses; for Mankind would, at such Seasons, avoid the Act of Generation; lest Beings so infamous, as they are superstitiously thought, should be the Product of their Embraces. ‘Yet, notwithstanding _Avicenna_ (says _Lemnius_[50]) does not account for this Doctrine, I will endeavour to reason upon it, and support it;’ which is an Evidence that he was so fond of it, that besides laying it down as the Opinion of the former, in order to gain the more Credit for the Notion, he runs into an anatomical Way of enlarging on it; the bare Recital of which, without the least Animadversion on it, will be sufficient to shew every judicious Reader, how Errors beget Errors, and may successively do so, to the End of time, whilst an implicit Credit is given to Mysteries of this kind[51]. ‘For at first, when the Uterus is cleansed by the Expurgation of the Humours, it acquires greater Heat, whereby the Semen Virile mixes the more powerfully with that of the Female, and is directed into the right Sinus of the Uterus, by the attractive Force of the Liver and right Kidney, from whence also, in these first Days, warm Blood is derived, to the Nutrition of the future Fœtus: Nor can the Parts on the left Side, being then cold, and void of Blood, immediately after the menstrual Discharge, contribute any thing; but Blood is by degrees drawn from the emulgent Veins of the left Side, which go into the Spleen and Kidney, so that, from the fifth to the eighth Day, some Blood flows from them, whereby the Fœtus is to be nourished; thus a Female is formed when these Parts compass their Strength, or are esteem’d as those of the Right out of their Situation, and also on Account of the Coldness of the Aliment. After the eighth Day, the Parts on the Right-side take the Office of preparing the Blood, which again begins to flow freely from them for the Growth of a Male.