m 
A SYSTEM OF 
As it ever was and mull be very difficult 
to give intelligent defcriptions of colours^, 
fo we are quite at a iofs to underftand the 
meaning of the antients in this reiped ^ but 
this indeed is of little confequence^ as we 
feem to have the fame rightj under the fame 
circumftanceSj of inventing new names for 
them I and that in whatever language we 
pleafe, Neverthelefs I have defcnbed fome 
ievr varieties of thofe v/hich at this time are 
the moft commonj to ferve as inilances* 
Brown opaque agate, with black veins, 
and dendriticai figures, the Egyptian 
pebble. 
Of a chalcedony colour, Rebates chake- 
donifans. 
i, Semi-tranfparent, with lines of a blackifli 
brown colour, and dendriticai figures, the 
Mocha ftone. 
This is much efteenied, and makes a 
valuable part of fome colledions, v/here 
it has a place 'chiefly for the fake of its 
figures, refembling vegetables, animals, 
&c. which however are often improved by 
art. 
Semi-tranfparent with red dots, Geni?m 
divi Stephani. 
When the points are very minute, fo 
as to give the flone a red appearance, it is 
by fome called Sardpa, 
Semi-tranfparent, with clouds of an orange 
colour. 
/. Deep red or violet, and femi-tranfparent^ 
f . Of many colours, or variegated. 
h. Black. 
There 
