26 iRambles witb IRature Stu&ents 



stones lying on the surface of the ground, and this 

 fact, taken in connection with the existence of our 

 rounded pebbles, shows that in early days the sea 

 must have rolled over this part of Middlesex, although 

 now it is the highest ground all round London. 



Another proof of this fact was afforded by oui 

 finding a fossil crab, which was discovered about 

 ten feet below the surface by some men who were 

 digging a well. 



ASH-BARK BEETLE (Scolytus) 



A piece of bark has fallen off an old gate-post, and 

 has revealed some markings on the wood beneath. 

 These I find are the work of a small beetle, which 



SCOLYTUS BORINGS. 



burrows under the bark of the ash tree and there lays 

 her eggs. When the grubs come out each one lives 

 and works in its own little tunnel, eating the wood as 



