Mr Hugh Miller on Boulder-Glaciation. 



179 



Around many of the larger boulders the current is seen to 

 have divided (Fig. 9). The longer axes of the little boulders 

 begin to diverge at the point of the big one, (with perhaps 



Fig. 9. 



Sketch-plan Fluxion-structure around a boulder (| natural size), Fore-shore, 

 Fillyside, near Edinburgh. The arrow denotes direction of ice-movement. 



a boulder or two stranded against its point,) and course 

 alongside it, keeping a general parallelism with the sides 

 as they go. A few inches on either hand the general 

 course of the current remained undisturbed. In all cases 

 which I have examined, the gritty matrix must have moved 

 past the stone as the tide moves past a skiff at anchor. 

 Fig. 10 is a sketch rudely representing a very delicate and 

 beautiful fluxion-pattern around a boulder in till, on the 

 South Tyne near Haltwhistle, more distinct in its fine hair- 

 lining than I would have expected to find in a gritty boulder- 

 clay. The boulder, which was somewhat pear-shaped, 5 

 inches deep, and of limestone, was striated from top to 

 bottom on the whole side that met the ice. The blunt end 

 was smooth, but I observed no striae ; and it resembled the 

 rounded joint of a bone, compared with its lined and glancing 

 shaft. Several converging lines showed that the current had 

 closed in after passing. * 



