The other _Epistle_, contains some Ingenious Observations, touching the way, by which the Chicken, yet in the shell, is nourish't, _videl._ not by the conveyance of the _Yolk_ into the _Liver_ by the _Umbilical_ vessels, nor into the _Stomack_ by the {178} _Mouth_, but by a Peculiar _ductus_, by him described, into the _Intestins_, where, according to his alledged experience, it is turn'd into _Chyle_: which he affirms, he hath discover'd, by taking an Egge from under a brooding Hen, when the Chicken was ready to break forth, and when he was looking for the passage of the _Yolk_, out of its integument into the _Liver_, by finding it pass thence into the _Intestins_, as he found the _White_ to do by the _mouth_ into the _belly_. Whence he inclines to infer, that, since every _faetus_ takes in at the mouth the liquor it swims in, and since the Chicken receives the _white_ of the Egge into the _mouth_, and the _yolk_ by the new discover'd _ductus_ into the _Intestins_, it cannot be certainly made out, that a _part_ of the _Chyle_ is conveyed into the _Liver_, before it passes into the _Heart_; Exhorting in the mean time the _Patrons_ of the _Liver_, that they would produce Experiments to evince their Ratiocinations. III. _Regneri de Graeff, de Succi Pancreatici Natura & usu, Exercitatio Anatomico-medica._ In this Tract, the Industrious Author, after he has enumerated the various opinions of _Anatomists_ concerning the use of that kernelly substance; call'd _Pancreas_ (in _English_, the _Sweetbred_) endeavours to prove experimentally that this _Glandule_ was not form'd by Nature, to separate any _Excrementitious_ humor, and to convey it into the _Intestins_, but to prepare an _useful_ juyce out of the Blood and Animal Spirits, of a somewhat _Acid_ taste, and to carry the same into the Gut, call'd _Duodenum_, to be there mixt with the Aliment, that has been in some degree already fermented in the Stomack, for a further fermentation, to be produced by the conflux of the said acid _Pancreatick_ juyce and some _Bilious_ matter, abounding with volatile Salt, causing an Effervescence; which done, that juyce is, together with the purer part of the nourishment, carried into the _Milkie_ veins, thence into the _common receptacle_ of the _Chyle_ and _Lymphatick liquor_, and so through the _ductus Thoracicus_ into the right Ventricle of the Heart.