[ 427 1 
tice of the expanfion of all fubftanccs by heat, and the 
cont ration of the fame by cold : from whence it 
muft follow, that the fpecific gravities of the fame 
bodies would conftantly be found lefs in the fummer 
and greater in the winter. And this he fhew’d from 
the experiments he had made upon feveral fluids, both 
in the fummer and the winter-feafons, by means of 
an inftrument he had contrived and called an Ara- 
ometer , being a large phial, to which he had ad- 
jufled a long and llender flem, whereby he could 
to good exadnefs determine, when it was filled with 
equal bulks or quantities of the feveral fluids he pro- 
pofed to examine. The refult of his trials with 
this inftrument he digefted into a fhort table, 
which was printed in the memoirs of the Aca- 
demy for the fame year 1699. This table 'John 
Cafpar Eifenfchmid afterwards republifhcd with fe- 
veral additions, in his trad 1Z&? Eonderibus et Men- 
Juris,, printed at Strasburg in 1708, 8°. changing it 
to a more convenient form for his purpofe, by re- 
ducing the different fluids therein named to the 
known bulk of a cubical ‘ Paris inch. So much of 
this table as I thought might be' of fervice,. I have 
here fubjoined to the others in * the following col- 
lection, but I have alfo made an alteration in the 
form, the better to fit it for general ufe, by omit- 
ting the ablolute weights of the feveral bodies in 
fummer and winter, and placing inftead of them, 
after the name of each body a decimal number, ex- 
prefling the proportion of its weight in winter to 
its weight in fummer, fuppofed to be every- where 
reprefented by unity. 
Sir 
