Page 138. " Farewell we call to hearth and hall! "

The Tolkien Ensemble perform Merry and Pippin's Farewell Song.

Page 141. " But that can only mean going into the Old Forest! "
Mysterious Forest
Creative Commons Attribution Share AlikeMysterious Forest - Credit: bogenfreund at Flickr
The Old Forest is a remnant of the primordial forest that had covered most of Middle-earth in ancient times. 

Much of Europe was similarly forested before the land was tamed for agriculture.