OVER THE HILLS AND FAR AWAY 31 



lucorum), and on the branches there were the strange 

 growths called Witches' Brooms. These are produced 

 by the irritation of a Fungus (Exoascus), which pro- 

 vokes a prodigious development of slender twigs, often 

 suggestive of a crow's nest. But now we are on the 

 road, and there is nothing for it but tramping and 

 thinking and watching the bats till we get home. 



