. [ SO ] 
perifh. Thefe bodies, thus attached, are the ftrongeft 
proof we can defire, that the Belemnite is of marine 
production. Indeed it may be objected, that the bonc3 
of quadrupeds, wood, and (tone have thefe bodies ad- 
hering to them, and therefore may be laid to be ma- 
rine, as well as the Belemnite. But when we bring 
them to chemical tryal, the objection vanifhes ; for 
the bones either come out of the furnace with a black 
core, or they are reduced to alhes ; whereas the Be- 
lemnite is changed into a fine calx, after the man- 
ner of all teftaceous bodies, and is converted into a 
fpecies of phofphorus [c]. The oiflers, having no 
loco-motion, frequently affix themfelves toother bo- 
dies, that they may be better able to Bern the tides, 
and currents, which might otherwife carry them 
from their proper beds, and places of feeding. This 
attachment to other bodies no way incommodes them, 
becaufe they increafe the dimenfions of their fbells 
by adding frefh laminae inwardly : the flrfl formed la- 
minae, being, as it were, excluded, lie in the manner of 
tiles upon the roof of a houfe, and exhibit the feveral 
fteps orflagesof their growth. 
I believe a Belemnite is very rarely found perfeCt in 
the foffil Bate : thofe in gravel-beds [d] have differed: 
very much by being rubbed againff Bones, &e. by 
the fluctuating waters : thofe, which we find in rubble 
at Garfington-pitts [ e\ have many adventitious bodies 
adhering to them, and confequently were deferted by 
[c] The Belemnite after calcination, has all the properties of 
the Bolognian ftone. If it be expofed a few minutes to the Sun, 
and immediately taken into a dark room, it will thine like Phof- 
phorus for fome time ; and when tire light diminiflies, it again 
expofed to the Sun, its fplendor will be renewed. 
[d] Fig xv. [<?] Fig. xvi. 
3 
their 
