[ 477 ] 
As to the abfolutc weight of water with which 
all the other bodies are compared in thefe Tables, 
Mr, Boyle tells us in his Medicina Hydroftatica , 
printed in the new Edition of his Works, V. 19, h. 
that he had found by his own experiments, that a cubic 
inch of clear water weighed 2 56 Troy Grains* And 
Mr. Ward of Ghefter , who afterwards purfued this 
affair with great accuracy, determined that a cubic inch 
of common clear water did weigh by his tryals 
253.18 like Troy Grains, or 0.527458 decimals of 
the Troy Ounce , or 0.578697 of the Ounce Aver- 
dupois , agreeable to what Mr. Reynolds had for- 
merly deliver’d, who found the inch cubic of Rain 
Water to weigh by his experiments 0.579036 deci- 
mals of the fame Averdupois ounce, differing from 
the other only 0.000339 parts. 
But, as the accuracy of all the experiments in 
thefe tables depends upon the identity of the 
weight of CommonWater, it may not be improper to 
afeertain that point by a Note taken from Mr." 
Boyle's Medicina HydroJlatica,Y . 18. h. where he 
ex pr dies himfeif in the following manner. 
“ It fpecioufly may, and probably will be 
“ objected, that there may be a great difparity 
“ betwixt the liquors that are called, and that de- 
i( fervedly, Common Water. And fome travellers 
** tell us from the prefs, that the water of a certain 
“ eaftern river, which if I miftake not is Ganges , 
“ is by a fifth part lighter than our water. But 
<c having had upon feveral occaftons the opportunity 
<c as well as curiofity to examine the weight of 
“ divers waters, fome of them taken up in places very 
“ diftant 
