THE FRESH- WATER LOCHS OF SCOTLAND. 61 
19, 1902, near tRe boathouse was 43°, and on returning to the same 
place at 12.30 (noon) it had risen to 46°*4 ; in the main basin, near the 
centre, the surface temperature was 42°’6. 
Loclian na h-Aclilaise (see Plate XVI,). — Lochan na h-Achlaise (or 
na-Hachlich) is irregular in form, the outline being somewhat triangular 
or heart-shaped, with the apex pointing south. It includes many larger 
and smaller islands, and the bottom in the shallower places is covered 
by stones and boulders. The length from north to south is over four- 
fifths of a mile, while the maximum breadth from east to west is about 
three-quarters of a mile, the mean breadth being over one-third of a 
FIG, 16. LOCHAN NA H-ACHLAISE. 
(Photograph hij R. M. Clarh, B.Sc.) 
mile. Its waters cover an area of about 183 acres, or nearly three- 
tenths of a square mile, and it drains an area of over one square mile, 
or nearly four times the area of the loch. The north-western portion 
of the loch is shallow, the deeper water being found in the southern and 
eastern portions. The 10-feet basin is a continuous area, extending 
from near the southern shore in a northerly and then north-easterly 
direction to near the north-eastern shore, excluding the islands lying 
off the eastern shore, and is nearly three-quarters of a mile in length. 
The 10-feet basin includes two 20-feet basins, the more southerly being 
the larger and deeper, the maximum depth of the loch (28 feet) having 
