C 403 1 
as is its Alveolus* The Variery of Gircuhfilances al- 
ready alleged of the Belemnites ferve to demonftrate 
the Improbability alfo of this Opinion, as it has 
done of the other two. The Numbers of Belem- 
nites of all kinds, fo plentiful every-where, and the 
Confideration of how few are furnifh'd with. Alveoli. 
Numbers, I am fenfible, have conic Cavities 5 but 
that thofe Cavities never did contain Alveoli , is evi- 
dent ; that the Sides of the faid Cavities are even* 
and without any circular or other Impreffions, which 
a Belemnites that h2s ever contained an Alveolus 
muft have ; that Body being in clofe Contad to 
all Parts of the invefiient Belemnites , muft confe- 
fequently imprefs it with its Concamcrations 5 which 
Impreffions muft be therefore found on $he Sides of 
the Cavities of all Belemnites which ever contained 
them. 
As for afferting, that all the Alveoli , which are 
now found loofe, were originally lodged in Belem - 
nites, it cannot be; without inferring alfo, that all 
Belemnites which are now devoid of Alveoli , con- 
tained fuch formerly $ which, by feme external or 
other Agent, have been forced out and loofened 
from them. 
To confider fuch an Agent, we muft alfo conclude 
its Force to have been exceeding great, to loofen 
out the A luck us of a Body in clofe Contad with all 
its invefiient Parts; and ftrengthen’d further to it by 
Ridges and Grooves, fuch a Force muft have com* 
prefs'd, fhattefd, and otherwise broken and deftroy'd 
the Belemnites that contain'd them j which is con- 
trary to Obfetvation. Further, forcing out the Al- 
veolus might perhaps eafily have happened to the 
conic Belemnites 1 which hath a Bafis of a larger 
Diameter 
