192 PROF. E. J. GARWOOD ON THE [May I906, 



underlying schist, which lies just beyond the photograph to the right. The 

 cave from which the spring formerly issued is seen in the distance ; while the 

 honeycombed appearance of the weathered rock is well shown. 



Fig. 2 is a photograph taken from the col looking down on to Lago Scuro. 

 It shows the circular shape of the outcrop and the reefs of rock separating the 

 lake into two portions, one of which is seen in shadow in the right-hand bottom 

 corner. The exit of the lake, where it overflows into the Val Cadlimo, lies on 

 the far side of the lake, on the extreme left. 



Plate XIII. 



Fig. 1 is a view of the western end of Lago Kitom ; the exit is masked by one 

 of the promontories of gneiss on the left of the picture. The wooded slope 

 behind the hotel is the 1930-metre hill. The lower portion, on which the hotel 

 stands, is formed of gneiss ; but the upper slopes, above and. to the right of 

 the house, are formed of the dolomite which sweeps round the end of the lake, 

 also rising to form the col over the hill to the left and up to a line half way 

 between the lake and the highest point — Fongio. 



Fig. 2 shows the fold of dolomite in the Campolungo Pass. The dolomite 

 strikes towards the observer on the left, dipping south-eastwards at a high 

 angle. The mass of dolomite occupying the centre of the picture has been 

 folded and faulted down to the right of the main outcrop, and it is possible 

 that it is continued under Lago Tremorgio, which lies immediately below, just 

 outside the right-hand corner of the picture. 



The flat little valley is evidently eroded out of the dolomite ; the stream 

 flowing along it comes from the lake high, up on the left, and appears to have 

 been a somewhat recent diversion. 



Plate XIV. 



Fig. 1 is a photograph of the lower end of Lago Tremorgio, showing the 

 steep high cliffs surrounding the lake and. the notch cut down at the exit. 

 These cliffs continue all round the rest of the lake, becoming nearly vertical 

 opposite the exit ; and it is over this cliff that the stream, shown in fig. 2 of 

 PI. XIII, falls into the lake. The outcrop of the dolomite lies at the top of this 

 cliff, to the right, outside the photograph. 



Fig. 2 shows the Lago di Lucendro, seen from the upper end. On the right is 

 the Fibbia gneiss, on the left the biotite-schist, the junction running down the 

 centre of the lake. The bare convex surface of the glaciated gneiss at the lower 

 end of the lake is well seen. The river in the foreground rises in the Lucendro 

 Glacier, and forms the source of the Eeuss. 



Plate XV. 



Fig. 1 is another view of the Lago di Lucendro, taken from high up on the 

 left bank. It shows the tongue of solid rock running back into the lake from the 

 exit, mentioned in the text (pp. 185 & 190), and also the glaciated Fibbia gneiss 

 near the exit. The dark rock in the lower part of the foreground is the outcrop 

 of the contorted biotite-schist penetrated by granite-veins. In the distance is 

 seen the St. Gotthai'd road, and beyond it the Hospice-lakes. 



Fig. 2 is a view of the Lago della Sella seen from near the exit, showing the 

 islands and illustrating its river-like character. The immediate foreground and 

 the right bank are formed of biotite-schist, penetrated in places below the exit- 

 by veins of granite, where it borders on the Fibbia gneiss ; while the greater 

 part of the left bank is composed of gneiss. (See also map, p. 186.) 



Plate XVI. 



Contoured map of Lago Eitom, on the scale of 20,000 : 3. For * Airola ' 

 read ' Airolo.' 



Plate XVII. 

 Contoured map of Lago Tom, on the scale of 5000: 1. 



