[ 4^0 ] 
The femidiaphanous Sulphur is a beautiful kind 
which I have but feldomfeen: it is in lumps of the 
fize of a final 1 bean. 
Coal, the forts here taken notice of are confi- 
derably lighter than Sulphur : but there arc many 
other kinds, and of different weights. 
I take the Gagates or Jet to differ very little 
from the Channel Coal. 
The different forts of Amber may be obferved not 
to differ confiderably in their feveral gravities. 
Sulphurs feem to be the lighted: of all mineral 
bodies. 
TABLE VI. 
OfG ums , Ref ms j &c. 
GUM Arabic. Freind. 
* • 
143 ° 
D°. Newton. C. i 
Opium. Freind. 
1.360 
Gum Tragacanth. Freind. 
m 
9 • 
Myrrh. Freind. 
• • 
1.270 
Gum Guaiac. Freind. 
• 
1.224 
Refina Scammonii. Freind. 
. ' « 
1.200 
Aloes. 7 . C. (qu. whether the refill or the 
wood). 
• 
1.177 
Afa fxtida, a very fine fample. 
Hauksbee. 
i.2fr 
D 9 . from c Dr. John Keill's 
Introd. ad 
*veram F hype am. 
• 
1143 
Pitch. Oxford Soc. C. 
• • 
1.170 
Thus. Freind. 
♦ • 
1. 071 
Camphire. Newton • C. 
• * 
0.95? <5 
Bees- wax. Cotes. 
9 
Cera. 
