[ 433 1 
great curiofity, and which arc now generally ufed, was 
in England in the year 1724. 
Profeflbr Peter van Mufschenbroek , of Utrecht, 
publifhed in his Elementa Phyjica at Leyden in 8°, 
1734. a large tabic of Specific Gravities, which he 
alter wards yet fomewhat farther enlarged in his 
Effai de Phyjtque in French , at Leyden 1739 . 4 0 . 
This table contains almofl: all the preceding ones, 
but without the names of the authors from whom, 
they were colleded. I have among thofe which 
follow inferted, under this author's name, fuch ex- 
periments as I had not before met with elfe where: 
making ufe of the Latin edition as the more cor- 
red, except in fuch articles which are only to be 
found in the French. 
Mr. John Ellicott F, R. S. having an opportunity 
in the year 1745'. to examine the weight of fome 
large Diamonds, he accordingly, with the utmoll 
care, and with exquifite afiay-fcales which very fen- 
fibly turned with the 200 th part of a grain, took 
the fpecific gravities of 14 of thofe Diamonds, 4 of 
which came from the Brafils , and the other 10 
from the Eajl Indies. Thefe experiments he com- 
municated to the Prefident of the Royal Society, 
who caufed them to be read at one of their meet- 
ings, and afterwards publifhed them in N°. 4 76. 
of the Philofophical Tranf actions. Among thefe 
Brafilian Diamonds, one was of the abfolute weight 
of 92,427, another of 88,21; and among the 
Eafl - Indian ones, one of 29,727 Troy grains. 
And as the ftze of thefe hones made them much 
L 1 1 2 fitter 
