(i6o) 
r er of an hour it began mSnifeftly to freeze the vapouirs and drops of water 
on the outfide of the Glafs. And when the frigorifick power was arriv d at 
the height,! feveral times found,that water ,thinly plac'd on the outfide,whilft 
the mixture within was nimbly ftirr'd up and down, would freeze in a quar- 
ter of a minute (by a Minute- watch*) At about \ of an hour after the infri- 
gidating Body was put in^ the Thermofcope,that had been taken out a while 
before,and yet was rifen but to the lowefl: freezing mark , being again put in 
the liquor, fell an inch beneath the mark. At about 25 houres from the firft 
Solution of the Salt I found the tinded liquor to be in the midft between the 
freezing marks, whereof the one was at 5^ inches ( at which height when the 
Tindure refted, it would ufually be, fome, though but a fraall,Froft abroad-) 
and the other at 4^ inches which was the height, to which ftrong and dura- 
ble Trofts had reduced the liquor in the Winter» At 3 hours after the begin- 
ning of the Operation, 1 found not the Crimfon- liquor higher than the upper 
Freezing mark newly mention*d ^ after which, It continued to rife very flowly 
for about an hour longer- beyond which time I had not occafion to obferve iu 
Thus far the Ncte-kck^^ wherein there is mention made of a Circumftancc 
of fome former Experiments of the like kind , which I remember was very 
confpicuous in this newly recited, jpor, the frigorifick mixture having been 
made in a Glafs -body fas they call it J with a large and flattilh bottom , a 
quantity of water ,which 1 (purpofely) fpilt upon the Table, was by the ope- 
ration of the mixture within the Glafs, made to freeze , and that ftrongly 
enough, the bottom of the Cucurbite to the Table ; that ftagnant liquor being 
turn'd into folid' Ice, that continued a confiderable while umhaw'd away, 
and was in fome places about the thicknefs of a half Crown piece. 
Another Obfervation, made the fame Spring, but lefs folemn, as meant 
chiefly to fliew the Duration of Cold in a high degree, is recorded in thefe 
terms : The firft time,the Seal'd Weather- glafs was pui in, before it touchM 
the common water ,it flood at 8|,having been left there a confiderable while, 
andonceor twice agitated the water, the tinfted liquor funk but t0 7J, or at 
furtheft,7f-; then the frigorifick liquor being put into the water with circum- 
ftances difadvantagious enough jn(about)half a quarter of an hour the tinned 
liquor fell beneath \\ ; and the Thermofcop^, being taken out , and then put 
in again, an hour after the water had been firft irifrigidaced/ubfided beneath y 
inchesjand confequently within | of^n inch of the mark of the ftrongly freez- 
ing weather^ 
7. Whereas the grand thing, that is like to keep this Experiment from be- 
ing as generally Vfeful, as perhaps it will prove Luciferom, is theDearnefs 
of Sal Armoniatk- two things may be offered to -Itffcn this Inconvenience^ 
For firft-, ^9,1 Armoniack might be made much cheaper, if inftead of fetching 
it beyond- fea,our Country, men made it here at home ; (which it may eafily 
'be, and I am ready to give you the Receipt , which is no great Secret.) But 
rfiextyl con{idercd,tha£ probably the infrigidating vertue of our mixture might 
idepend upon the peculiar Texture of the Sal A rmoniack , whereby, whileft the 
Water is diffolving it, either fome Frigorifick particles are extricated ;rnd 
excited,or (rather) fome particles, which did before more agitate the minute 
fares of the water , arecxpell'd (or invited out by the ambient Bodies) or 
come 
