259 
of Edinburgh , Session 1878-79. 
side, indicating that the smoothing agent had partially entered the 
hollow, and had worn down a portion of the east side. 
Assuming that the general course of the striating agent here was 
from W.hr.W; towards E.S.E., it is quite intelligible that when this 
agent, if of a flexible nature, impinged on a rock surface dipping to 
the north, its direction would change so as to he more to the 
eastward. 
There is another rock of larger dimensions about a mile to the 
west of Linton village, on the line of the North British Eailway. 
It is about 25 feet in length and about 18 feet in height, and 
Fig 1. — Rock on Railway,, near Linton, 
presents a surface nearly vertical. It is on one side of a gully 
through which the railway passes, the rock being on the south side 
of the line. 
The rock was discovered and exposed to view, when an excavation 
for the railway was made into a thick bed of boulder-clay which 
occurred here. The rock now seen had previously been entirely 
covered by the clay. With the consent and the assistance of the 
railway authorities, I had an additional portion of the rock at its 
west end stripped of the clay, to the extent of several square yards, 
when more smoothing and striation was brought to light. 
Besides the rock which forms the lowest and principal part of 
