C 39 1 
The Bekmnite receives its Englifh name Thun^ 
der-bolt, from the vulgar, who fuppofe it to be 
indeed the darts of heaven. The Bekmnite if rub¬ 
bed will take up chaff, and other light bodies like 
amber. Burnt or fcraped with a knife, they 
yield an odour like rafped horn. After calci¬ 
nation, has all the properties of the Bologniaii 
Stone, which, if expofed a few minutes to the 
fun, and immediately taken into a dark room, 
will fhine like Phofphorus for fome time; and 
when the light diminifhes, if again expofed to 
the fun. its fplendor will be renewed. 
STONES. 
Which reprefent the interior form of univalve 
Pulls; in which they were moulded when foft, 
F I G. XL VI, 
Of a cylindric form rounded at one end, at 
the other four fpires. Free Stone, 
Fig. 47. Is a recent fhell of the fame genus 
with the fhell in which this ftone was formed. 
FIG. 
