4797. °° antiquities in Scotland. 129 
which resort to it asa place of fhelter. The vitrified 
wall is only to be seen on the outside. 
=== — 
: PLAN OF KNOCKFERREL. 
Nor are these walls readily distinguifhable at 2 
distance, because they are not raised in a perpendi- 
cular direction, but have been carried up, sloping in- 
wards at top, nearly with the same degree of inclina~ 
tion as the sides of the hill; so that they seem, wher 
_wiewed at a small distance, to be only a part of the 
till itself. 
It appears at first sight surprising that a rude 
people fhould have been capable of discovering a cement 
of such a singular kind as thisis. It is lefs surpri- 
sing that the knowledge of it fhould not have beea 
carried into other countries, as distant nations m 
those periods had but little friendly intercourse with 
one another. But it is no difficult matter for one 
who is acquainted with the nature of the country 
VOL. ix. R t 
