SoLLAS — A Map to shoto the Distribution of Eslcers in Ireland. 



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accompanied by one or more parallel ridges, and about one mile from its con- 

 fluence with tbe eastern chains it becomes a plexus, formed by the union of four 

 approximately parallel ridges. It is difficult to estimate its height, on account 

 of the undulating nature of the surrounding country, which is sometimes higher 

 on one side of an esker than on the other ; from 30 to 60 feet is a sufficiently 

 close approximation. The following Table shows how the chain rises in passing 

 from south to north, the ground rising with it : — 



North of Dunmore, up to its confluence with the eastern chains, the chain lies 

 in a broad, gentle depression ; the ground on each side rising gradually to a 

 height of between 400 or 500 feet above the sea. 



3. The Tuam chain. — This (fig. 2) is of about the same length as the Dun- 

 more chain, but it is interrupted in the middle by a wide gap about 5^ miles long. 

 It southern moiety runs at first from west to east, but soon turns into the south- 

 west to north-east direction, taken by the corresponding parts of the more con- 

 tinuous chains ; the northern moiety runs due north. The following Table shows 

 that this chain, like the preceding, rises as it proceeds north ; the country rising 

 with it in the same direction : — 



The country between the Dunmore and Tuam chains is richly dotted over 

 with conical gravel mounds. 



4. The Kilnalag chain. — This chain (fig. 2), which is not quite 14 miles in 

 length, runs at first from south-west to north-east, and then turns due north, 

 which direction it maintains for the greater part of its course. At Ballyphilipeen, 



