M. A. Guyot on (he Erratic Basin of the Rhine. 21 



it accompanies and mixes with it, and soon appears only in 

 insulated blocks along the eastern border of the basin of the 

 Linth. In the neighbourhood of Chateau de Kybourg and 

 Winterthour, the rocks of the Rhine again meet with their 

 congeners, which descend by the principal valley by turning 

 round the mountains of Appenzell. 



The principal branch follows the valley of the Rhine. On 

 the left side, the boundary line runs along the mass of the 

 Sentis, turns round the mountains of Appenzell, reaching 

 the summit of the passages, without letting any other debris 

 escape to the interior of the country than a few small blocks 

 or rolled pebbles, passes on the heights which overlook 

 Rheinach and Rorschach, turns to the south-west by the hills 

 situate to the south of St Gall, reaching nearly to Herisau, 

 passes to Tegerschen, intersects the plateau de Magdenau, 

 cuts the valley of Thour transversely near lonschwyl, then 

 resuming its normal direction towards the north-west, it runs 

 along by Bichelsee and Schauenberg, towards Schlatt and 

 Winterthour. Further on, it follows the valley of Tocss, 

 and crossing the Rhine near Eglisau, reaches the heights near 

 Neuenkirch and Du Uauden to the west of Schaffliouse. 



The eastern limit, or that of the right side, at first almost 

 effaced by the immense fall of linestones in the vicinity of 

 Luciensteig and Balzers, soon rises to a considerable height 

 on the Frastensersand above Feldlkirch. On the eastern 

 declivity of this same chain, many hundred feet higher still, 

 we find the erratic formation of the long valley of Montafun, 

 To the north of Feldkirch, it runs along the heights of Vo- 

 lalberg above Embs, of Dornbirn and Sulzberg, passes Holz- 

 leuten in the neighbourhood of Stauffen, then by the heights 

 of Ebrazthofen and Isny. Further to the north, the points 

 of Schellenberg and PfuUendorf, which I owe, the first to M. 

 De Buch, the second to Professor Walchner, will very nearly 

 fix the extreme limits of the basin. The rocks of the Rhetian 

 Alps ascend, we observe, to the summit of the plateaux of 

 Suabia, and even encroach on the domain of the Danube. 

 On the east and north, the limit is difficult to trace ; the 

 blocks are small and thinly scattered, for the most part 

 rolled, lost under the earth or among the accumulation of 



