SNOW-MUSHROOMS AND CAHOTS 253 



ties, and the tendency is for the path to acquire 

 a sHghtly undulating surface. 



Muddy lanes are sometimes trodden into trans- 

 verse furrows by cattle, the intervening ridges being 

 separated by a uniform distance, which is equal to 

 the length of stride of the beasts. I have come 

 across several examples, the best of which was on 

 the track to a pond where the cattle drank, but I 

 have not watched the process of treading. I pre- 

 sume, however, that the cattle, seeking the firmer 

 ground, tread where their predecessors trod, thus 

 deepening and regularizing the troughs and leaving 

 the weaker ridges untrodden. 



