In order to the diſcovery of ſome hints of the account, upon which the above mentioned mixtures were more intenſely frigefactive than ſnow alone, we ſealed up a ſingle vial of ſnow unmingled with any other ingredient, and found it to thaw much more ſlowly than any of thoſe parcels of ſnow, which we had mixt with ſalts or ſpirits.
Source: wiktionary