as the most ingenious Artists cannot trace her ways, or imitate her actions; for Art being but a Creature, can do or know no more then a Creature; and although she is an ingenious Creature, which can and hath found out some things profitable and useful for the life of others, yet she is but a handmaid to Nature, and not her Mistress; which your _Author_, in my opinion, too rashly affirms, when he says,[3] That _the Art of Chymistry is not onely the Chambermaid and emulating Ape, but now and then the Mistress of Nature_: For Art is an effect of Nature, and to prefer the effect before the cause, is absurd. But concerning Chymistry, I have spoken in another place; I'le return to my former Discourse: and I wonder much why your _Author_ is so opposite to the Schools, concerning the doctrine of the Gall's being a receptacle for superfluities and dregs; for I think there is not any Creature that has not places or receptacles for superfluous matter, such as we call dregs; for even the purest and hardest Mineral, as Gold, has its dross, although in a less proportion then some other Creatures; nay, I am perswaded, that even Light, which your _Author_ doth so much worship, may have some superfluous matter, which may be named dregs; and since Nature has made parts in all Creatures to receive and discharge superfluous matter, (which receiving and discharging is nothing else but a joyning and dividing of parts to and from parts,) why may not the Gall be as well for that use as any other part? But I pray mistake me not, when I say _superfluous matter or dregs_; for I understand by it, that which is not useful to the nourishment or consistence of such or such a Creature; but to speak properly, there is neither superfluity of matter nor dregs in Nature. Moreover, your _Author_ mentions a _six-fold digestion_, and makes every digestion to be performed by inbreathing or inspiration; For _in the first digestion_, he says, _The spleen doth inspire a sowre Ferment into the Meat: In the second, The Gall doth inspire a ferment, or fermental blas into the slender entrails: In the third, The Liver doth inspire a bloody ferment into the veins of the Mensentery_, &c. I answer, first, I am confident Nature has more ways then to work onely by Inspirations, not onely in General, but in every Particular. Next, I believe there are not onely six, but many more digestions in an animal Creature; for not onely every sort of food, but every bit that is eaten, may require a several digestion, and every several part of the body works either to expel, or preserve, or for both; so that there are numerous several Motions in every Creature, and many changes of motions in each particular part; but Nature is in them all. And so leaving her, I rest, Madam, _Your Faithful Friend_ _and Servant._ [1] _Ch._ Of a Six-fold digestion. [2] See _The passive deceiving of the Schools, the humorists,_ c. 1. [3] _Ch._ Heat doth not digest efficiently. XXXI. _MADAM,_