In the first Papers of these _Philosophical Transactions_, some promise was made of a _fuller_ account, to be given by the next, of the _Experimental History of Cold_, composed by the Honourable Mr. _Robert Boyle_; it being then supposed, that this _History_ would have been altogether printed off at the time of publishing the {47} _Second_ Papers of these _Transactions_; but the Press, employed upon this Treatise, having been retarded somewhat longer than was ghessed, the said promise could not be performed before this time: wherein it now concerns the inquiring World to take notice, that this subject, as it hath hitherto bin almost totally neglected, so it is now, by this Excellent Author, in such a manner handled, and improved by near _Two hundred_ choice _Experiments_ and _Observations_, that certainly the _Curious_ and _Intelligent_ Reader will in the perusal thereof find cause to admire both the Fertility of a Subject, seemingly so barren, and the Author's Abilities of improving the same to so high a Degree. But to take a short view of some of the particulars of this _History_, and thereby to give occasion to _Philosophical_ men, to take this Subject more into their consideration, than hitherto hath been done; the Ingenious Readers will here see, 1, That not only all sorts of _Acid_ and _Alcalizate_ Salts, and Spirits, even Spirit of Wine, but also Sugar, and Sugar of Lead mixed with Snow, are capable of freezing other Bodies, and upon what account they are so. 2, That among the Substances capable of being frozen, there are not only all gross sorts of Saline Bodies, but such also as are freed from their grosser parts, not excepting Spirit of Urine, the _Lixivium_ of Pot-ashes, nor Oyl of Tartar, _per deliquium_, it self. 3, That many very spiritous liquors, freed from their aqueous parts, cannot be brought to freeze, neither naturally, nor artificially: And here is occasionally mentioned a way of keeping _Moats_ unpassable in very cold Countries, recorded by _Olaus Magnus_.