i: 472 ] 
their fpecific Gravities, as in the following Table, may 
fully be depended on, 
I have fet down the Weights of the feveral Dia- 
monds both in Air and Water, that if any Miftake 
Ihould have happened, it may be the more eafily 
testified. I am. Sir, with the greateft Refped, 
Tour obedient humble Servant, 
John Ellicott, 
• 
In Air 
InWater 
Specif. 
Grav. 
Water .... . . 
, , 
. . 
IOOO 
N°. 
Grains Grains 
1 
A Brazil Diamond, fine Water, rough Coat 
92,425 
66,16 
35 l8 
2 
A Brazil Diamond, fine Water, rough Coat 
88,21 
63,16 
35 21 
3 
Ditto, fine bright Coat* 
10,025 
7,170 
35 1 1 
4 
Ditto, fine bright Coat, . 
q,c6o; 6,830 
35 QI 
5 
An Eajl India Diamond, pale blue, . . 
26,48? 
18,945 
35 12 
6 
Ditto bright yellow .... 
2 3>33 
16,71 
35 z 4 
7 
Ditto, very fine Water, bright Coat, 
20,66 
14,8 
35 2 5 
8 
Ditto, very bad Water, honeycomb Coat, 
20,38 
* 4>59 
3 5 1 9 
9 
Ditto, very hard blewifh Call, 
22,5 
16,1 
35*5 
10 
Ditto, very foft, good Water, 
22,6 1 ? 
16,2 
35 z 5 
U 
Ditto, a large red foul in it. , 
25,48 
18,23 
35 1 4 
12 
Ditto, foft bad Water . . ... 
29,525 
21,140 
35 21 
13 
Ditto, foft brown Coat, ...... 
26,535 
18,99 
35 l6 
14 
Ditto, very deep green Coat,- . . , 
25,25 
1 8,08 
3521 
The. mean Specific Gravity of the Brazil Diamonds appears to be 35 1 3, . 
The mean of the Eajl -India. Diamonds, - «. * 3519- 
The mean of Both to be - - - 35 17* 
A 
XX. 
