inced? And whether it is caused by the intrusion of Air? As also,
whether, what is contained in icy bubbles, is true and Springy Air, or not.

8, What Bodies they are, that are contracted by Cold; and how that
Contraction is evinced? Where 'tis inquired, whether _Chymical Oyles_ will,
by Congelation, be like expressed Oyls, contracted, or, like aqueous
Liquors, expanded?

9, What are the wayes of _Measuring_ the _Quantity_ of the Expansion and
Contraction of Liquors by Cold? And how the Author's account of this matter
agrees with what Navigators into cold Climats, mention from experience,
touching pieces of Ice as high as the Masts of their Ships, and yet the
Depth of these pieces seems not at all answerable to what it may be
supposed to be.

10, How strong the Expansion of freezing water is? Where are enumerated the
several sorts of Vessels, which being filled {50} with water, and exposed
to the cold Air, do burst; and where also the weight is expressed, that
will be removed by the expansive force of Freezing? Whereunto an Inquiry is
subjoyned, whence this prodigious force, observed in water, expanded by
Glaciation, should proceed? And whether this _Phaenomenon_ may be solved,
either by the _Cartesian_, or _Epicurean_ Hypothesis?

11, What is the _Sphere of Activity_ of Cold, or the Space, to whose
extremities every way the Action of a cold Body is able to reach: where the
difficulty of determining these limits, together with the causes thereof,
being with much circumspection mentioned, it is observed, that the _Sphere
of Activity_ of Cold is exceeding narrow, not only in comparison of that of
Heat in Fire, but in comparison of, as it were, the _Atmosphere_ of many
odorous Bodies; and even in comparison of the _Sphere of Activity_ of the
more vigorous Loadstones, insomuch, that the Author hath doubted, whether
the Sense could discern a Cold Body, otherwise then by immediate Contract.
Where several Experiments are delivered for the examining of this matter,
together with a curious relation of the way used in _Persia_, though a very
hot Climate, to furnish their _Conservatories_ with solid pieces of Ice of
a considerable thickness: To which is added an Observation, how far in
Earth and Water the Frost will pierce downwards, and upon what accounts the
deepness of the Frost may vary. After which, the care is inculcated, that
must be had, in examining, whether Cold may be diffused through all
_Mediums_ indefinitely, not t