Professor T. O. Bonney—Lahe-basins in the Aljos. 



17 



almost from east to west, and its upper end descends from a bold 

 craggy peak, which is called the Pizzo Columbe, and is formed of 

 dolomitic limestone (a variety of the rauchwacke). On either side 

 of tliis peak gaps, about 7,800 feet in height, lead to the upper part 

 of the Lukmanier Eoad. After the first descent from these passes, 

 the bed of the valley falls rather gradually and is fairly open, the 

 mountains rising with moderate steepness on the southern side and 

 precipitously on the northern. Sheltered in a recess in the latter side, 

 just before we reach a break in the level of the valley, we find the 

 Lago Cadagno (6,303 feet). It occupies a kind of cirque or gigantic 

 corrie. Steep crags of gneiss sweep round about one half of it ; 



North. 



i llulometer 



South. 



Fig. 2. — Broken tiorizontal lines : Gneiss, with garnet and actinolitic schists (in 

 northern part) . 

 Vertical lines : Schists, micaceous, quartzose, and calcitic. 

 Coarse dotted : Rauchwacke. 

 Fine dotted : Alluvial. 

 White: Water. 



the western end is barred by a spur, formed of an infold of 

 rauchwacke, followed by a mass of dark micaceous schist ; the former 

 corresponding with a slight depression, the latter with a hill. The 

 lake is nearly 900 yards from east to west, but a small marsljy 

 plain shows that it has once extended rather farther in the latter 

 direction ; it is about 275 yards across. The stream draining it 

 flows from the south-west end. The character of the ground 

 makes it difficult to speak positively, and one or two low mounds 

 near the stream may be morainic, but the minor ridges in the 

 neighbourhood of the more open side are clearly live rock, and the 

 stream itself passes over the same at a level a very few feet indeed 



BECADE lY. VOL. V. ^O. I. 2 



