THE FRESH- WATER LOCHS OF SCOTLAND. 
125 
entire lake-floor about 42 per cent, is covered by less than 10 feet of water, 
and about 8 per cent, by more than 20 feet of water, so that one-balf is 
covered by water between 10 and 20 feet in depth. The temperature of 
the water was practically uniform throughout, the surface reading being 
48°*0 Fahr., while a reading at 34 feet gave 47°*2. 
Milton Loch (see Plate XLIII.). — Milton Loch lies less than a mile to 
the east of Auchenreoch Loch, and about 8 miles from Dumfries. It is 
irregular in outline and conformation, the general trend being from north to 
south, but the southern portion curves round Milton point towards the east. 
The loch exceeds a mile in length, with a maximum breadth of half a mile. 
The superficial area is about 153 acres, or nearly a quarter of a square 
mile, and the drainage area is nearly 2 square miles. The maximum depth 
of 15 feet was recorded both in the northern and southern parts of the loch, 
there being two 10-feet areas separated by shallower water at the central 
narrows, the greatest depth between Green island and the opposite shore 
being 9 feet. The volume of water is estimated at 45 million cubic feet, 
and the mean depth at nearly 7 feet. Of the entire lake-floor about 78 per 
cent, is covered by less than 10 feet of water. The loch was surveyed on 
May 3, 1905, when the elevation was 410’0 feet above the sea, or rather 
higher than that determined by the Ordnance Survey on December 5, 1893, 
viz. 409’6 feet. The temperature of the water was uniform throughout, 
identical readings of 47°*0 Fahr. being taken at the surface and at 15 feet. 
Loch Arthur (see Plate XLIII.). — Loch Arthur (or Lotus Loch) is 
situated about 4 miles to the east of Milton Loch, and drains into the Kirk- 
gunzeon lane at Killywhan Bridge. It is surrounded by cultivated stony 
fields, with a strip of wood nearly all round and a plantation on the north- 
east ; the shores are stony, with granite boulders. The loch is two-thirds 
of a mile in length from east to west, with a maximum breadth across the 
middle of nearly one-third of a mile, the superficial area being about 
74 acres. The basin is simple, the contour-lines coinciding with the out- 
line of the loch, and fairly deep. The maximum depth of 50 feet was 
observed towards the south-eastern angle, but there is a considerable area 
approximately in the centre of the loch, equal to one-fourth of the total 
area, in which the depth exceeds 40 feet. The mean depth is estimated at 
nearly 26 feet, or over one-half of the maximum depth, and the volume of 
water at 83 million cubic feet. The loch was surveyed on May 4, 1905, 
when the elevation was 239‘8 feet above the sea, as compared with 240*1 
feet determined by the Ordnance Survey on January 23, 1894. The 
temperature of the water was practically uniform throughout, a reading at 
the surface giving 47°*2 Fahr., and at 45 feet 46°*9. 
