$70 Observations on an 
tains, which ebb and flow periodically. The 
Bolderborn of Westphalia, may be reason- 
ably pronounced to be of this description; as 
for the fountain of Jnpiter in Dodona, we 
know too little of it to judge of its true cha- 
racter; and it is not improbable but future 
observations will add Pliny’s Well to the class 
of irregular reciprocators. 
It may be reasonably supposed, that since 
I have endeavoured to confine the esta- 
blished theory of reciprocation to one or 
two springs at most, a new explanation will 
be offered on my part, comprehending the 
phenomena of those wells, which ebb and 
flow according to no certain rule. Before 
I make this attempt, it will be proper to 
give a more circumstantial account of the 
appearances exhibited by the well at Gig- 
gleswick, than has hitherto been published. 
I neglected, when in the country, to pre- 
serve a correct register of its fluctuations, 
and committed no other observations to wri- 
ting, except those which appear in a former 
part of this essay. This omission, however, 
has been fully supplied by Mr. John Swainston, 
of Kendal; to whom I formerly communi- 
cated my imperfect remarks on this well, re- 
questing him at the same time to note down 
a series of its operations, at some copvenient 
, 
