52hardning and tempering of Steel,
endeavour'd to be shewn and explicated
by several Reasons and Experiments:
the reason of the colours on
53Lead, Brass, Copper, Silver, &c. other
Instances of such colour'd bodies in
animal substances: several other
distinguishing Observations. Des Cartes
54Hypothesis of Colours examin'd. An
Hypothesis for the explication of
light by motion, indeavoured to be
explicated and determined by several
55Reasons and Experiments: three
distinguishing Properties of the motion
56of light. The distinguishing Properties
of a trasparent Medium [that
there seems to be no Experiment that
proves the Instantaneous motion of
57light] the manner of the propagation
of light through them. Of the
homogeniety and heterogeniety of
transparent Mediums, and what
effects they cause on the Rayes of light,
explicated by a Figure: an Examination
58of the refraction of the Rays
by a plain Surface, which causes Colours.
An Examination of the like effects
59produced by a spherical Surface:
the use that may be made of these
Experiments, for the examination of
several Hypotheses of Colours. Des
60Cartes Hypothesis examin'd. Some
61Difficulties taken notice of in it. What
seems most likely to be the cause of colour:
that propriety is indeavoured
92to be shewn in a Glass ball: that the
reflection is not necessary to produce
63Colours nor a double refraction: the
Hypothesis further examined, both in
64the pellucid Medium and in the Eye.
The definitions of Colours; and a further
65explication and examination of
66the Proprieties of laminated Bodies;
67by what means they conduce to
the production of Colours.
Observ. 10. Of Metalline Colours.
68That all Colours seem to be caus'd by
refraction. An Hypothesis consonant
69hereunto, explicated by Figures. How
several Experiments, of the sudden
changing of Colours by Chymical Liquors
70may be hereby explicated: how
many wayes such Chymical Liquors
may alter the colours of Bodies.
71Objections made against this Hypothesis
of two colours only, indeavoured
to be answer'd, by several Reasons
72and Experiments. The reason why
some Colours are capable of being diluted,
others not: what those are: that
probably the particles of most metalline
Colours are transparent; for this
several Arguments and Observations
73are recited: how Colours become incapable
of diluting, explicated by a
74Similitude. An Instrument, by which
one and the same coloured Liquor at
once exhibited all the degrees of colours
between the palest yellow and
deepest red: as likewise another that
exhibited all varieties of blues: several
Experiments try'd with these
75Boxes. An Objection drawn from the
nature of Painters colours answered:
that diluting and whitening a colour
are different operations; as are
deepening and blackening: why some
may be diluted by grinding, and some
other by being tempered with Oyl:
76several Experiments for the explicating
77of some former Assertions: why
Painters are forced to make use of
many colours: what those colours are:
78and how mixt. The conclusion, that
most coloured Bodies seem to consist
79of transparent particles: that all colours
dissoluble in Liquors are capable
of diluting: some of mixing, what
a strange variety may thereby be produc'd.
Observ. 11. Of the Figures of Sand.
80Of the substances and shapes of
