( io6 y 
of their Refradions but as loooo Is to 6885 Bees-Wax, ■ 
To is 5941 Antimony to the fame Radius ■> that is, as 
one to 1. 1 6, or thereabouts. Like wife Oil ot Vitriol is 
in Specifick Gravity to Oil of Safafras, as 1510 is to 
• 898 5 yet the Ratio of Retraction of the lighteft is moft 
confiderable, being in proportion as 10000 is to 6475 
Safafras 5- lb is the fame Radius to you Vitriol. Thus 
I find, that a Body doth not Refrad in proportion to 
its Specifick Gravity, but from fome quality peculiar to 
its felf 5 whether it be from its Inflammability, or from 
any different Texture, or Figure of its Component 
Parts , or whatever elfe it be, I (hall, with the Appli- 
cation of thefe Experiments, fubmit to this Honourable 
Society to determine. 
Specifick Gravities in 
comparifon with a 
bulk of Water e- 
qual to 820 Grains 
Oil of Safafras 898 
Turpentine 713*5 
Bees -Wax 66 2 
Car away es 7 5.2 
Oranges 71I 
v ‘' Hyfop 7 ^ 9 - 5 . 
Rofemary 747 
Savin 789 
Origanum 7 §2 
Pennyroyal. 7 83 
/ * Mint 780.5 
Spike 749 
rennel 79 ^ 
Juniper 
Cummin 766.5 
%nfe } ' 757 
Angle of Ratio of 
Obfervation. Refradion, 
d. ! 
as 10000 is to 
16.50 
74®S-J 
29.20 
6475.8 
25.25 
674I.8 
25.30 
6885.4 
26.13 
6696.5 
25.20 
674I2 
25.10 
6757.6 
24.40 
6794.7 
25.30 
673O.9 
25.00 
6770.2 
25.30 
6750.9 
26.00 
67O6.4 
24.30 
6807.J 
27.10 
' 66l6.5 
25.10 
6757.6 
2 7, 00 
6627.7 
23.46 ’ 
6865.I 
