*j66 Mr. hutciiins’s Experiments for afcertalning 
wood for lightnefs, which 1 found would remain in the gela- 
tinous freezing mixture at any depth I chofe ; but when in- 
ferted into tlie quicklilver contained in the gallipot, the great 
dilproportion of gravity made it rebound upwards, and by the 
touch l could ealily perceive, by the refinance it met with, 
whether it proceeded from quickfilver in a fluid or congealed 
ftate. The event did not anfwer my wilhes, for I could not 
find that the quicklilver was frozen in the leafl during the trial. 
Indeed the temperature of the air was not favourable, being 
under 20° below the cypher. The large quantity too of the 
quicklilver in the gallipot, as well as the thicknefs of that 
vefiel, might both of them contribute to render the operation 
unluccelsful.; yet, as the apparatus thermometer fhewed the 
fame degree ( - 40) as when quicklilver froze in the glal's cy- 
linder, I am of opinion it would congeal by this Ample me- 
thod in very cold weather, and a long continued application of 
a proper degree of cold by the mixtures. 
Experiment IX. made February 22, 1782. 
Whiift I was attending on the preceding experiment (the 
5th) and had removed the inftruments into a fecond mixture, 
the former one by this means being unemployed, I put into 
it a gallipot (the fame I ufed in the eighth experiment) with 
about three quarters .of a pound of quickfilver, and let it re- 
main immerfed in the mixture a conflderable time (I fuppofc 
near half an hour), and finding, by touching with a quill, 
that part of it was congealed, I drew the gallipot out, it being 
previoufly flung with a firing, and decanted off the fuper- 
incumbent mixture and fluid quickfilver; the remainder, about 
two- thirds of the whole quantity, remained folid in the galli- 
pot ; 
