XXVII . — Supplementary Observations to Dr . Berger s Account of the 
Isle of Man . 
By J. S. HENSLOW, Esq. 
MEMBER OF THE GEOLOGICAL SOCIETY. 
[Read April 7, 1820.] 
In laying before the Society the following remarks, I beg leave 
to state that my intention is not to attempt a minute description 
of the geological features of the Isle of Man, but chiefly to point 
out the localities of several formations unnoticed by Dr. Berger in 
his account of the Island, inserted in the second volume of the 
Transactions. With this view I shall not trespass on the time of 
the Society, by repeating the description of any place he may have 
already mentioned, unless where I have thought him too brief or 
erroneous ; but, as I have sometimes found it necessary to differ 
from him, I must offer in my defence the information I have 
received from gentlemen of this Society, who have assured me, that 
his account was drawn up from loose memoranda, long after he 
had left the Island, when, probably many facts had escaped his 
memory. At the same time, having his observations before me, 
I was naturally induced to become more anxious in my research 
wherever I imagined there appeared to be any inaccuracy in his 
descriptions. 
