Cole — The Prohlem of the Liffey Valley. 19 



DESCEIPTIOISr OF PLATES. 



Plate I. 



Drainage- map of the country between Saggart aud Pollaphuca. (Based on 

 the maps of the Ordnance Survey.) 



Plate II. 



Fig. 



1. Junction of the Liffey and the Kings River. The Liffey meanders in a 



broad drift-filled valley, descending from Kilbride. The Kings Eiver 

 crosses the view in front. 



2. The Pollaphuca fall in flood-time. 



3. Mature valley of the Brittas Paver, looking down from near Brittas 



towards the Liffey valley at Kilbride. 



4. The Slade of Saggart ; evening. 



5. View looking south-east along the Pollaphuca barrier and across the Liffey 



gorge. 



6. The Liffey gorge above Pollaphuca. 



Plate III. 



7. The G-len in Britonstown, looking up. Former course of the Liffey across 



the Pollaphuca barrier. 



8. The Pollaphuca barrier from the north. The head of the dry ravine opens 



beyond the white house among the trees in the middle distance on the 

 left. The present ravine of the Liffey is seen on the right. 



9. The drift-filled basin of Blessington, looking north-east from the Pollaphuca 



barrier. The head of the Liffey gorge lies in the foreground. 



10. Drift terrace in process of erosion by the Liffey, showing the glacial 



infilling of the Blessington basin. View north from above Horsepass 

 bridge. 



{The figures are from photographs hy the, author'). 



