278 B ATM Y METRICAL SURVEY OF 



a maximum depth of 29 feet, the other to the north of the island including 

 the deepest water in the loch. 



The following temperatures taken in the deepest part show a range of 

 0< 9 Fahr., a fall of 4 ; 8 being recorded between 25 and 45 feet : 



Surface 56-0 Fahr. 



25 feet 53-9 



45 49-l 



Lochan na Gealaicli (see Plate CXXIII.). This small loch is situated 

 about a mile to the north-west of Loch Awe, into which it drains at Tay- 

 chreggan, and is sub-circular in outline, with a maximum diameter of about 

 one-fifth of a mile, and covering an area of about 1(> acres. Two soundings 

 were taken at the maximum depth of 25 feet near the middle of the loch. 

 The volume is estimated at 7 million cubic feet, and the mean depth at 

 10 feet. It was surveyed on May 25, 1903, but the level could not be 

 determined. The surface temperature was 59*0 Fahr. 



Portsonaclian Hill Lochs (see Plate CXXIII.). Four little lochs at an 

 elevation of 1300 feet and over on the hill to ^the south of Portsonachan 

 were sounded by members of the Lake Survey staff, while engaged on the 

 survey of Loch Awe, on May 28, 1903. The most northerly one, called 

 Rainbow Loch, has a maximum depth of 26 feet ; the neighbouring one, to 

 the south-west, called Loch Choire na Cloich, has a maximum depth of 

 20 feet ; the next one, to the south, called Lochan Dhu, has a maximum 

 depth of 12 feet ; while the most southerly one, called Lochan Allt na 

 Mult, is the smallest and shallowest of the group, not exceeding 3 feet in 

 depth. 



Sior Loch (see Plate CXXIX.). The name Sior Loch is applied to 

 three shallow little lochs about 1J miles to the south-west of Loch 

 Nant, into which they drain by the Abhainn Cam Linne. They are rapidly 

 becoming bog very reedy, with the bottom covered by a thick mass of 

 vegetation. The middle loch was the only one sounded on June 4, 1903, 

 as the boat could not be transported to the other basins ; the maximum 

 depth of 4 feet was observed in several places towards the east end. The 

 elevation given on the Ordnance Survey map is 733 feet above the sea, 

 though the date is not mentioned. 



Loch Nant (see Plate CXXIII.) lies little more than 2 miles north-west 

 of Loch Awe at Kilchrenan, but drains northward into Loch Etive. It is 

 irregular in outline, trending in a north and south direction, and is nearly 

 a mile in length, with a maximum breadth of one-third of a mile. Its 

 waters cover an area of about ] 40 acres, and it drains an area exceeding 

 9 square miles, including Sior Loch. The maximum depth of 92 feet was 

 recorded in the southern portion of the loch. The volume of water 

 is estimated at 148 million cubic feet, and the mean depth at over 24 



