The Heddon Slack. 



Showing its gorge-like character and large windings, and, in 

 the foreground, the flat slack-bottom covered with bents- and 

 rank growth. 



The Callerton Slack. 



View of the intake of the slack taken from the north, showing 

 how the watershed is breached by it. The slack winds round to 

 the left in front of the plantation. 



