SNOW-MUSHROOMS AND CAHOTS 235 



My first observation on ascending the steep 

 portion of the quarry road just above the railway- 

 station was that the undulations were of consider- 

 ably greater height, and that there were more 

 ridges in continuous series than was the case in 

 September, 1901. This I attribute to the circum- 

 stance that the summer of 1901 had been a dry 

 one, whereas that of 1902 had been unusually 

 wet at Coniston. 



Plate XL VII., from a photograph taken on 

 August 13, 1902, shows a series of the undulations. 

 The dimensions of the ridges, proceeding uphill, 

 were as follows, the height being taken at both 

 sides of the track :— 



Mean length = 14 feet 9-2 inches. Mean height = 7-5 inches. 

 Wave-length divided by height = 23-685, 

 Wave-length divided by length of sledge = 3" 165. 



It will be observed that the length of the 

 undulations was practically the same as in 1901, 

 the same sledges being in use. 



