thawed? And also, whether frozen and thawed Harts-horn will yield the same quantity and strength of Salt and saline Spirit, as when unfrozen? _Item_, Whether the _Electrical_ faculty of _Amber_, and the _Attractive_ or _Directive_ Virtue of _Loadstones_ will be either impaired, or any wayes altered by intense Cold? This Head is concluded by some considerable remarks touching the operation of Cold upon Bones, Steel, Brass, Wood, Bricks. 7, What Bodies are expanded by being frozen, and how that expansion is evinced? 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?