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given us in the faid book the weight of a cubic inch 
of 24 different fubftances, both in Troy and Aver - 
dupois ounces and decimal parts of an ounce; which 
he further allures us requir’d more charge, care, and 
trouble, to find out nicely, than he was at firft aware 
^ of. This table appears to have been well-efteem’d, 
and to have had the fan&ion of Mr. Cotes’s appro- 
bation, by his taking it, when reduced to the com- 
mon form, into that collection which he drew up 
for his own hydroftatical lectures. 
Roger Cotes M A. and RkmianTrofeffor ofAftro- 
nomy and experimental ThiloJophy at Cambridge , firlt 
giving about the year 1707 a Courfe of Hydroftatical 
and Tneumatical Experiments, in conjunction with 
Mr. Whifton in that Univerfity, drew up, for the 
ufe of that courfe, a very accurate Table of Specific 
Gravities, collecting from feveral places fuch expe- 
riments as he took to be moft exaCt, and the belt 
to be depended upon. And as the judgment of fo 
great a man cannot but give a general reputation to 
fuch experiments as he had fo fele&ed, I have 
thought proper, in the following tables, to diftin- 
guifh all luch by the addition of the letter C, after 
the names of fuch perfons from whom they firft 
appear to have been taken, adding alfo the name of 
Cotes at length, to fuch others as I have not met 
with elfewhere, and which I therefore take to have 
been tranferibed from the memoranda of his own 
experiments. This table of Mr. Cotes’s ufed firft to 
be given in M.S. to thofe who attended his lec- 
tures , but it was afterwards printed in a tingle fheet, 
relating to a Courfe of Experiments at Cambridge 
in 
