and found
the recesses of the _Gills_ so form'd, that the water taken in at the
mouth, being let out by these dores, cannot by them re-enter, by reason of
a skin outwardly passing over every hole, and covering it. Where he
intimates, that though Fishes have not _true_ Lungs, yet they want not a
_Succedaneum_ thereto, to wit, the _Gills_; and if _water_ may be to
Fishes, what _Air_ is to terrestrial Animals, for Respiration: affecting,
that whereas nothing is so necessary for the conservation of Animal life as
a reciprocal Access and Recess of the _Ambient_ to the sanguineous vessels,
tis all one, whether that be done by receiving the Ambient _within_ the
body, or by its gentle passing _by_ the _Prominent_ vessels of the _Gills_.

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