C 4 l6 3 - 
IX. "Tables of fpecific Gravities, extracted 
from various Authors , with fome obferva - - 
tions upon the fame\ communicated in a 
Letter to Martin Folkes Efq\ Prefident of 
the Royal Society, £y Richard Davies M.D . 
Presented Fzb. HE manifold applications which 
* 747* may be made, for the purpofes of 
Natural • Philofophy, of the relations which Bodies 
bear to each other, by their refpective Specific Gra- 
vities, engaged me lome years fincc to collect all the 
experiments of this fort I could meet with in the 
courfe of my ftudies, and alfo to make feveral new 
ones of my own with the fame defign. 
When my collection began to be fomewhat con- 
fiderable, I difpofed the feveral bodies in Tables ac- 
cording to their fpecies, which I found to be the 
moft convenient method, as my tables were by 
this means capable of receiving additions in any 
part, without deftroying the form of the whole . 
and as they were thereby eafy and ready to be con- 
futed, and well difpofed for the forming of imme- 
diate comparifons between the feveral bodies of the 
fame fpecies. . . 
But having now no farther opportunities of en- 
larging my colledion, I hereby beg leave to recom- 
mend the profecution of my ’defign to others, as a 
fubjeCt well deferving the attention of fome of the 
members of the Royal Society , to whom I therefore 
Prefent thefe my tables : wilting they may prove of 
r fome 
