THE FRESH-WATER LOCHS OF SCOTLAND. 
361 
The following table gives the approximate areas between the 
contour-lines laid down at intervals of 100 feet, with the percentages 
to the total area of the loch, and shows a gradually decreasing area 
with increasing depth : — 
0 to 100 feet 
1412 acres 
35 ‘3 per cent. 
100 „ 200 ,, 
1257 „ 
31-5 
3 5 
200 ,, 300 ,, 
1073 „ 
26-9 
J 3 
Over .300 ,, 
253 „ 
6-3 
O 
.3995 ,, 
1000 
3 5 
Through the kindness of Mr. Thomas Honeyman, factor to Cameron 
of Lochiel, we have inspected a bathymetrical chart of Loch Arkaig, 
based upon soundings taken in 1889 by an officer in the German army 
named Sandler. The chart is drawn to the scale of 1| inches to the mile, 
and the soundings are given in fathoms. A comparison of Sandler’s 
map with the Lake Survey map shows that — (1) Sandler’s soundings are 
much less numerous than those taken by the Lake Survey, and many of 
his lines were taken in zigzag fashion instead of running at right angles 
to the axis of the loch ; (2) though there is a general agreement 
between the two maps, the Lake Survey map shows as a rule rather 
deeper water, position for position; for instance, taking the deepest 
sounding on each of Sandler’s lines, and placing it approximately on 
the Lake Survey map, deeper soundings occur in the vicinity ; thus 
Sandler’s deepest sounding in 55 fathoms (330 feet) approximates to the 
Lake Survey maximum in 359 feet. 
T emperature Observations . — ^The surface temperature in the centre 
of the loch varied from 48°-3 Fahr. to 51°*5 during the three days of the 
survey; near shore it reached 52°-3 on June 13. A series taken in the 
main basin on June 11 showed a range of 4°*7 from the surface to 280 
feet, the greatest variation being observed in the superficial layers of 
water, as shown in the accompanying table : — 
Surface 
10 feet 
25 „ 
50 „ 
100 ,, 
150 „ 
200 „ 
250 ,, 
280 „ 
49° -4 Fahr 
48° -9 „ 
47° -5 ,, 
46° -5 ,, 
45° -5 „ 
45° -0 ,, 
44° -9 ,, 
44° *7 „ 
44° -7 „ 
Loch P attach (see Plate LXXXIX.). — Loch Pattack (or Pattaig) lies 
at a considerable elevation among the mountains which separate Loch 
Ericht from Loch Laggan. It is only about 2 miles distant from Loch 
Ericht, though it belongs to a different drainage system, draining by 
