Page:Philosophical Transactions - Volume 003.djvu/128

 First, the said Van Horne makes the Spermatick Artery in man to goe to the Testiclcs in a winding, but De Gaaf, in a streight way.

Secondly, the former affirms, that the vasa deferentia have no communication with the vesiculæ seminales; but the latter maintains, and demonstrateth it to the Ey, there is so great a commerce betwixt them, ut semen dum à Testibus per vasa differentia affluens in Urethram efftuere nequit, propter carunculam clausam; necessariò in influat in Vesiculas, in iisque pro futuro coitureservetur.

Thirdly, the former is of opinion, triplicem esse materiam seminis; but De Graaf will have but one only; answering the Arguments, used both by Van Horne and Dr. Wharton to prove that triplicity.

But that, which De Graaf much insists on in this Book, is, to shew what is the true Substance of the Testicles, and to vindicate the Discovery thereof to himself; affirming positively, that no man, before him ever knew the truth of it. For the making out of which, he first denyeth, that the Testes are glandulous, or pultaceous; and then affirms that their substance is nothing else but a Congeries minutissimorum vasculorum semen conficientiam, quæ si absque ruptione dissoluta sibi invicem adneiteretur, facile viginti ulnarum longitudinem excederent. Which he affirms, he can grove by ocular Demonstration.

Then he sheweth, how the seminal vessels pass è Testibus ad Epididymides, vid, not by one Trunck (as Dr. Highmore thinks) but by 6. or 7. small ductus's; assigning the cause, why Doctor Highmore did not see them.

Further he examines, An semen in testibus conficiatur; utrum ex Sanguine vel ex Lympha; quomodo elaboretur, craisescat, lactescat: qua via à Testibus ad Urethram excurrat.

Moreover he endeavours to prove, Vesiculas seminales ordinatas esse non seminis generationi, sed receptieni & asservationi.

He also observeth concerning the seminal matter, that 'tis composed ex duplici materia, which after Aristotle, he calls, λόγος ωερμαπχόυ χαί mi Byron an-eggaaflruév, considering this twofold matter like Dough and Ferment, this infecting and quickening that, and the grosser part being a conservatory and vehicle to that, which is most elaborate.

When he examine the Penis, he taketh notice, Omnes  Rh