Manchester Memoirs, Vol. xlviii. (1904), No. ^0. 5 



Tracing of one of the mole runs that are seen at this season, 

 when the animals work near the surface among the young crops. As 

 the mole extends the run a low ridge is formed on the surface of 

 the field. The runs appear to radiate generally from a bank, in 

 which it may be presumed that the fortress is situated. 



