C 395 ] 
in my reading his learned and curious Obfervations 
in Natural Hiftory, made in the Southern Parts of 
France , where he accompanied Monfieur CaJJini de 
Thury in meafuring a Degree of the Meridian, 
Thefe Obfervations are publifhed with Monfieur 
Cajfims Book : But as the reverfe of feveral of the 
Opinions deliver'd in his Memoir is experimentally 
found to be true, and as the Difcovery of Truth, and 
carefully feparating it from Deception, fhould be the 
only Aim of our Phiiofophizing, I take the Liberty 
of laying before you my Opinion thereon. 
X. AbJlraSi of a Letter from Mr. William 
Arderon, F \ R . S. to Mr. Henry Baker, 
E R.S. concerning the perpendicular Afcent 
of Eels* 
Read Jan. 29. 
1 746-7. 
Norwich , July 9. 1746, 
SIR, 
^yTHEN I read, fome Years ago, what 
Dr. Riot in his Hiftory of Stafford- 
shire relates concerning the Pafiage of Eds acrofs 
Meadows, in the Night time, from Pond to Pond 3 
I could hardly forbear thinking, that the Gentleman 
there mention'd mu ft: by fome means or other have 
been deceived 5 but what I have lately feen with 
my own Eyes gives me great Reafon to believe his 
Account to be ftrictly true. 
On the 1 2th Day of laft Jane , whilft I was view- 
ing the Flood-Gates belonging to the Water-works 
in this City of Norwich , I beheld a great Number 
of 
