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Part III. — Seventeenth Annioal Report 



(2) Loch Arklet, 



This loch is situated in the valley that stretches across from Inversnaid 

 on Loch Lomond to Stronachlacher on Loch Katrine. It is a small loch, 

 being only about a mile in length, by about four or live hundred } r ards 

 broad. Loch Arklet is surrounded on all sides by rising ground, except 

 towards the west ; and therefore, though it is much nearer to Loch 

 Katrine, the stream which issues from it — called the Arklet Water — flows 

 westward into Loch Lomond, forming, where it terminates, the well- 

 known Falls of Inversnaid. 



Loch Arklet, according to the Ordnance Survey maps, is about four 

 hundred and sixty feet above the sea ; it is therefore considerably above 

 Loch Lomond or even Loch Katrine. The depth of the loch at the 

 deepest part is a little over ten fathoms, but this depth is of limited 

 extent. At my visit on 27th June 1898 I got a sounding at sixty-one 

 and a half feet. 



This loch was visited on 9th September and 26th November 1897, and 

 on 15th March and 27th June 1898. 



Loch Arklet is the property of Mr. Dunsmure of Brenachoil and Inver- 

 snaid Lodge. Through the influence of Sir John Murray I obtained 

 liberty to make an examination of the loch, and had also a rowing-boat 

 placed at my service. Moreover, Mr. Dunsmure very kindly sent his head 

 gamekeeper to assist me, and him I found most obliging and helpful. 



Temperature and other Physical Observations. 



On account of the situation and limited dimensions of Loch Arklet the 

 temperature of the water was found to differ to some extent from that of 

 Loch Lomond. The annexed Table shows the temperature readings 

 obtained on the four occasions the loch w T as examined : — 







Temperature. 



Wind. 







Date. 



Hour. 



Air. 



Water. 



Direction. 



Force. 



Weather. 



Surface Movement 

 of Water. 







Surf. 



5 fins. 









1897. 

 Sept. 9 



Nov. 26 



6p.m. 

 11 a.m. 



Dogs. 

 46-4 



Degs. 

 56-9 

 45-0 



Degs. 

 55-6 

 45-0 



Deqs. 

 7 fms. 



55 0 

 lOfms. 



45 0 



Variable. 

 S. Westerly. 



Light. 

 Squally. 



Fine. 



Dull, shwry. 



Smooth. 



Somewhat rough. 



1898. 

 Mar. 15 



June 27 



5 p.m. 

 4p.m. 



46-5 

 63-5 



38-4 

 61-0 



38-9 

 58-3 



lOfms. 



39 0 

 lOfms. 



54-0 



Southerly. 

 Easterly. 



Squally. 

 Light. 



Cold, sh" wry. 

 Cloudy, fine. 



Somewhat rough. 

 A slight ripple. 



The surface reading for 9th September is fully three degrees Fahrenheit 

 below that of Loch Lomond for the corresponding date. All the readings 

 for November are also three degrees lower, and the surface reading for 

 March is nearly four degrees less than that of the same date for Loch 

 Lomond. It will also be observed here, as in the case of Loch Lomond, 

 that the temperature of the water at the different depths in November 

 and March is uniform or nearly so. The June readings for Loch Arklet, 

 both surface and under-surface, are higher than those for the upper end 

 of Loch Lomond; the temperature at ten fathoms shows a difference of 

 nearly five derrrees. The difference between the lowest and highest of 

 the surface readings for Loch Arklet is 22*6 degrees, while between the 



