Part II. in the Cku AT ION. 297 



rent Species fliould not only mingle together, but 

 alfo generate an Animal, and yet that that hybri- 

 dous Produdion (hould not again generate, and 

 fo a new Race be carry 'd on, but Nature fhouid 

 flop here, and proceed no farther, is to me a 

 Myftery, and unaccountable. 



One thing relating to Generation I cannot 

 omjt j that is, the Conftrudion of a Sett of tem- 

 porary Parts (like Scaffolds in a Building) to ferve 

 a prefent End, which are afterwards laid afide^ 

 afford a ftrong Argument of Council and Defign. 

 Now for the Ufe of the Young during its Inclo-r 

 fure in the Womb there are feveral Parts form'd, 

 as the Membranes inveloping it, call'd the Secun- 

 dineSy the umbilical Veffels, one Vein, and two 

 Arteries; the Uracbus^ to convey the Urine out 

 of the Bladder, and the Placenta Uterina-, part 

 whereof fall away at the Birth, as the Secundines 

 and Placenta ; others degenerate into Ligaments, 

 as the UrachuSy and part of the umbilical Vein ; 

 befides which, becaufe the F^tus during its abode 

 in the 'Womb hath no Ufe of Refpiration by the 

 Lungs, the Blood doth not all, I may fay, not 

 the greateft part of it, flow thro' them, but there 

 are two Paffages or Channels contrived, one call'd 

 the Foramen Ovale^ by which part of the Blood 

 brought by the Vena Cava paffeth immediately 

 into the Left Ventricle of the Heart, withput 

 entrjng the Right at all; the other is a large ar- 

 terial Channel paffnig from the pulmonary Arte- 

 ry immediately into the Aortay or great Artery, 



which 



