IN THE ¥ORTH DISTRICT. 439 
transmits water upwards through the seams. The rock- 
iike structure of this substratum corresponds with what 
was remarked at Fall-in; and the specimens from that 
quarter exhibit a similar redundance of sand. It also cor- 
responds with what appears at every deeper section of this 
extensive clay-field, which probably all reposes on sand and 
«mall gravel. 
At this point, the surface of the clay declines towards its 
margin. The same has been frequently remarked along all 
the verge of the Carse districts, and is particularly apparent 
where the form of the adjacent rising grounds presents the 
resemblance of small bays on the margin of the valley. In 
these the clay-soil is observed to be of a superior quality, 
for agricultural purposes. 
Allan-Park, Stirling, ) 
' 15th October 1824. j 
