130 



else are they so conspicuous from the fact that at these localities 

 they are further removed from the main mass of Oolites in the 

 escarpment. Near Bridport, Colmer's Hill is a well-known Knoll 

 of Midford Sands and many other outliers of the Sand and 

 Inferior Oolite are met with in this neighbourhood. Further 

 north again similar Knolls occur near Montacute and other places 

 between Ilminster and Castle Gary. Those near South Cadbury 

 indicate how the severance of outliers from the main mass may 

 take jjlace. 



Subterranean drainage and erosion in the first instance may 

 lead to the formation of underground channels in the impervious 

 Lias Clays beneath the porous Midford Sands and the Limestones 

 of the Inferior Oolite. The Limestones themselves maj'' be in 

 part wasted by chemical dissolution, and if channels are formed 

 in subjacent strata, slight subsidences must take place here and 

 there, and pave the way for the disconnection of portions of the 

 main Limestones to form outliers. The subsequent more 

 complete isolation of the severed masses, is due to the superficial 

 and subterranean denudation by rain and streams. And in the 

 case of Brent Knoll, as well as in that of Glastonbury Tor (to 

 some extent), the influence of the estuarine waters that once 

 spread over the Somersetshire levels, must have helped to com- 

 plete the denudation. The preservation of both Brent Knoll and 

 Glastonbury Tor, however, appears to be due to the basin-shaped 

 arrangement of the strata, and this although slight, has exercised 

 some influence on the agents of subaerial denudation. 



Place-Names derived from Plants (in the Neighbourhood of Bath). 

 Bii Kev. Canon Ellacombe. . 



(Read March 16ih, 1886.) 



I feel that I ought to apologise to the members of the Club 

 for offering them a paper on such a hackneyed subject as Place 

 and Plant-Xames ; but by limiting the question to the neighbour 



