(2) 
tion from all those, who are fond of this particular 
study; and that they will also be not entirely unin- 
‘teresting to the Public at large,—particuiarly when I 
declare, that they contain no statements but such as 
have been founded on my own knowledge and ob- 
servation, and that the principal motive which has 
induced me to offer them to general notice, is, to 
invite attention to a small, but rich field for investi- 
gation; a field hitherto but little regarded, or at most 
but cursorily examined. 
Among the vast number of strangers, independent 
of its own inhabitants, and those of its more immediate 
neighbourhood, who visit Plymouth during the sum- 
mer months, for the sake of seeing the many interest- 
ing objects which it affords, particularly. that national 
and stupendous work the Breakwater in our Sound, 
very few perhaps have the least conception, that the 
immense masses of stone of which it is composed, and 
the quarries’ from whence they have been taken, as 
well as the whole stratum or bed of limestone, ex- 
tending from those quarries westward as far as the 
Tamar, contain,’ besides many beautiful and well de- 
fined crystallizations, various organic remains of animals, 
