frigoric

— The Insinuation of this cold Moisture by the Skin into the Body, is a very likely Cause of cold-catching, as the Attack of that Indisposition is most common and general at the off-going of Frost or Storms by Rain, misling, or thick Fogs. And perhaps in this cold moist Air may be a Mixture of some frigoric Principle or Matter, which may some how or other vitiate our Blood and Lymph. For to say that Cold is only a Privation of Heat, is saying nothing ; or may be retorted, that Heat is only a Privation of Cold. But it is more probable, that there is an Addition of some saline Mixture with the Air ; Why otherwise cannot artificial freezing be performed without Salts ? Why otherwise does Water fo expand itself by freezing, as the intense Cold makes the intermixed Air shrink into less Space, as fuzed Metals expand by the Interposition of igneous Particles that have separated the Cohesion of the Parts of the Metals? Why otherwise does Water sometimes freeze in a warmer Air, when the Spirits in the Thermometer stand in 55 Degrees, at other times it freezes not in a much colder, as when the Spirits are sunk to 65? Will Water freeze at all, or as soon, in vacuo, as in the open Air ? Do not Snow Waters, or. Water from melted Ice, produce greater Mischiefs in animal Bodies than other Water? If Congelation be only a Privation of Heat, then are the Stiria, or Hairs, in a beginning Congelation of all congealable Liquors of the same Figure? Is not the dissolved Water of Ice much colder than before it was frozen, and unfit for several Purposes?