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# Title: An Essay Concerning Humane Understanding (shelfmarks Leibn. Marg. 38; ZEN Leibn. Marg. 38)
# Folio 58, page id 778263916:0074
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Primary Oualities
brouoht eo chine, that Sveetness and Whiteness are not really in Manna;
rhich are but the effeets of the operations ol Manna, by the motion, (IZC.
and ficure of irs Particles on the Fres and Palare, as the pain and sckness
caused by Manna, are contessedr nothine but the efeCtS Ot IES OPCra-
tions on the Stomach and GutS, bY the (12C, motion, and Erure of irs
insensible parrs; (For by nothing else can a Body opcrate, a5 has been
Proved:) As il it could not operate on the Ryes and Palate, and thereby
produce in the Nind particular distinct Ideas, wrhich in it self ic HaS nOE,
25 ell as re allorr it can operate on the crurs and Stomach, and
thereby produce distinct Ideas, Wrhich in ic selF it has nOt. Fhese
Ideas beins all effects ot thie operations ot Manna, on several parES
oFour Bodies, by the size, figure, number, and motion of its parts, Wtry
thole produced by the F.yes and Palate, Mould rather be thoughe to be
realsy in the Manna, chan those produced by the Stomach and GTULS; Or
ertr the pain and sickeness, Ideas thatare the effects of Manna, Mould be
thousht to be no-rhere, When thes are noc telt; and vet the srectness
and irhrirenels, effects of the lame Manna on other parts ot theBody, Dy
vars equalas untenomn, Bould be thoughe to exist in the Manna, Wrtien
they are not scen nor tasted, rould nced lome Reason to explain.
6. F9. Tet us consider the red and white colours in Porphyre: FTinder
lighe, buc from sriking on it, and its Colours vanim; it no longer pro-
duces any such Ideas in us: Upon the return ot Lighe, it produces these
appearances on us asain. Can any one chint any real alterations arc
made in the Porphyre, by the presence or absence of Lishe; and that
those Ideas oEerhiteness and redness, are really in Porphrre in the ligHt,
Wrhen tis plain it has no coleur in the dark: IEhas, indeed, such a Confi-
suration of Particles, boch nisht and day, as are apt, by the Rays ot
Lisht reboundins trom lome Parts of that hard Stone, to produce in us
the Idea oF recness, and from others the Ldea of wtriteness: But erhite-
nels orredness are not in it at ans time, but sueh a texture that hath thre
Doerto produce such a sensation in US.
5. 20. Pound an Almonc, and the clear irhire Colour ill be altered in
to a direr one, and thesireet Fast into an eily onc. What real Alceration
can the beatins ofthe Peltlemake in any Body, bur an Alceration ol the
Texture oFit:
5. 22. Ideas Deins thus distinguithred and understood, we may be ablo
co sire an Account, hor the lame Water, ac the lame cime, may produce
the Idea oF Cold br one HTand, and ot HIcar by che ottier: Whercas it is
impossible, that the lame Water, if those Idéas ivere really in it, Mould
at the lametime be both FTot and Cold. Por it ve imagine Warmth, as
it is inour Flands, to De nothine but a certain sort and decrée of Motion in
the minure Particles of our Nerves, or animal Spirits, e may under-
Stand, hou it is possible, that the same Water may at the Pame time pro-
duce thesensation ot ITcat in onc Eland, and Cold in the otber: which
Vet Figure never does, that never producins the Idea oF a lquare by one
ITand, Wvhich has produced the Idea ot a Clobe br another. But il the
Sensation of FTeat and Cold, be nochins bue the increale or diminurion ot
the motion ot the minure Parts oF our Bodies, caused by theC orpuscles
OF ans other Bods, it is casie to be understood, That it that morion De
oreater in one ITand, than in the othier; it a Body be applied to the EnO
FTands, Which has in its minure Parricles a preater motion, than in thole
OFoneot tho FTands, and a less, than in thole os the ottier, it viil in-
crease the motion ot thre one Fland, and lessen it in the ottier, and so cause
the ditterent Senlations of Lleat and Cold, that depend thereon.
3. 2a 2