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of thefc Vaults I have pick’d up feveral Kinds of 
Foflils, figur’d by marine Bodies ; fuch as Echini , 
Tettunculi , common or fluted Cockle, Belemnita , 
&c. and, by diligent Search, other Sorts might per- 
haps be lound. Sounds made beneath thefe arched 
Roofs are flrongly refle&ed from Side to Side; fo 
that the leaft Whifper may be heard at a confidera- 
ble Diftancc. The Beat of a Pocket-Watch was 
heard diftinaiy full twenty Yards from where it was 
vifited this Place on the ift Day of November 
laft, in order to try the Temperature therein, as to 
Heat and Cold ; and carried with me a Thermome- 
ter regulated by one of Mr. Enuksbee s, which I let 
down^at the further End of thefe Caverns; and let- 
ting it remain there for fome time, 1 found the 
Mercury refted at f 2 °. which comparing with the 
Regifter I had kept, was, I found, within half a 
Degree of a Medium betwixt the greateft Heat and 
the & fharpeft Cold we have known in this City for 
ten Years paft j and it is very probable, if the two 
Extremes had been taken more exactly, the Tempe- 
rature in thefe Caverns would be found to come yet 
nearer to the Medium of Heat and Cold in tnis 
Climate. 
Hauksbee * s Therm. 
The greateft Degree of Heat was July 1 8« 1746* *5 
The greateft Degree of Cold was Jan. 9. 1740. 00 
103 
5H 
Which added together make 
The Medium of which is 
