652 



DR HUGH ROBERT MILL ON THE 



to thirty in the case of the Arran Basin — gave the total volume of the basin in 

 question as accurately as the observations to be made use of renders necessary. 



The tidal rise at spring and neap tides was taken from the charts and from the 

 Admiralty Sailing Directions for the West of Scotland ; the mean rise is assumed to be 

 the arithmetical mean of the spring and neap rise. 



The average depth is obtained in each case by dividing the volume by the superficial 



area. 



Table II. — Volume and Average Depths of the Divisions of the Clyde Sea Area. 



Division. 



Number 

 of Cross- 

 Sections. 



Area in 



Square 



Sea Miles. 



Volume. 



Cubic 

 Sea Miles. 



Average 



Low 



Water 



Depth. 



Fathoms. 



Average 



Low 



Water 



Axial ' 



Depth. 



Fathom?. 



Tidal 

 Rise. 



Feet. 



Volume 

 of Tidal 



Increment. 



Cubic Sea 



Miles. 



Gareloch, ... 



Loch Goil, 



Loch Long, 



Holy Loch, 



Loch Strivan, Rothesay 

 Bay, &c, . 



Loch Ridun and Kyles, 



Loch Fyne, 



Dunoon Basin, 



Estuary, .... 



Arran Basin, Central, 

 „ „ Eastern, 

 „ ,, Western, 

 „ „ North-eastern, 

 Total, . 



Great Plateau, . 



Total of Sea Area, 



3 

 3 

 6 



2 



9 

 9 



10 



15 

 8 



10 

 7 

 6 

 7 



30 

 7 



3-28 

 2-61 

 3*24 

 1-24 



9-22 



7-75 



22-00 



36-92 



20-80 



531-00 

 242-90 



0-0240 

 0-0372 

 0-0326 

 0-0107 



0-1619 

 0-0971 

 0-4981 

 0-7378 

 0-1089 

 2-0197 



11-9671 

 3-5420 

 0-5084 



18-0372 

 5-7997 



n 



14 

 10 



H 



in 



121 

 22£ 



20 

 5 



34 



24 



18 

 301 

 24" 

 121 



291 

 21 

 401 

 38f 



761 



741 



61 



471 



68 



9 

 9 

 9 



8 



9 

 9 

 8 

 8 

 9 



8 



n 



0-0049 

 0-0039 

 0-0048 

 0-0016 



0-0138 

 0-0116 

 0-0286 

 0-0480 

 0-0312 



0-6900 

 0-3140 



102 



880-96 



25-5452 



29 





H 



1-154 



Tidal Conditions. 



The tidal currents of the Clyde Sea Area are, as a rule, not very rapid in the 

 wider channels, nor in the upper reaches of the loch basins. The strength of the 

 current is most apparent in the Channel, where a thorough mixing of water from 

 surface to bottom appears to take place at each flood and ebb. Similar effects are 

 seen at the narrow entrances to the loch basins, especially at Otter, the entrance to 

 Loch Fyne, and Row, the entrance to the Gareloch. At each of these places a 

 long spit of sand or shingle runs out from the eastern shore, and is only covered 

 for a short time about full tide. Hence the current is forced to pass through a 



