_Avicenna_[44] sums up a great many Causes for Masculinity and Femineity, as his Translator _Gerardus Cremonensis_ translates it: For the former, or the Production of Males, the Heat and Abundance of the _Sperma virile_; its being promoted from the right Testicle; because (according to our Author) it is of a thicker Consistence, more hot, and drawn from the Right-Rein, _è rene dextro_; which is, says he, both warmer and higher than the other as being nearer the Liver; its falling into the right Side in the Coitus, _&c._ and that on the other Hand Females are engender’d by Causes contrary to these: All these Opinions he has gather’d from _Hypocrates_, _Galen_, and _Rhasus_, and because he does not seem in the least, to contradict them, we are inclin’d to believe them his own also. Now from this Manner of accounting for Masculinity and Femineity, or the Production of Males and Females, there arises a third Doctrine to which this Author seems to assent, and by which he accounts for the rise of Hermaphrodites; and tho’ he confesses that some say so; which signifies he has it from others, yet he delivers it with an Air of Approbation, and consequently was not displeased with the Hypothesis[45]. ‘And some say, that if it runs from the Right-side of the Man to the same of the Woman, it produces a Male; and from their Left-sides a Female; and if from the Man’s Left-side to the Right of the Woman, the Production will be a masculine Woman; but if from his Right, to her Left-side, it will be a feminine Male.’ If the old Doctrine[46] of Males being proper to the Right-sides, and Females to the Left, of both Sexes, in the Act of Generation, were true, (which cannot but seem obsolete before even a Capacity of the lowest Class) this crossing the Strain, in the Manner he relates, might hold, and would not be an unpleasant Method of explaining the Nature of the Growth of these Androgyni; but I believe, that Notion is so much exploded already, as not to need taking pains to Invalidate. Let us, however, accept it as this Author’s Opinion, and a Variety from that of any other; and proceed to shew, that _Lemnius_ has mistaken _Avicenna_, when he ascribes to him the Opinion contained in the following Words[47]. ‘When the Menses have come down, and the Uterus is cleansed, which happens about the fifth or seventh Day, if a Man cohabits with a Woman any time from the first to the fifth after they have ceased, a Male will be begotten; from thence to the eighth a Female; again from that to the twelfth a Male; but after that an Hermaphrodite. For the Words of _Avicenna_ according to _Gerrard_’s Translation, are very different from the above quoted by _Lemnius_, tho’ they import the same thing; yet they are far from being his Opinion, because he plainly rejects it as unreasonable, having it from another[48] Author, thus _Avicenna_[49]: ‘And some of them say, who speak without Reason, _&c._’