XCviii PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



Ardenne, E. 25° N. ; Condros, E. 35° N. ; Taunus, E. 33° 13' N. ; 

 Binger Loch, direction of the quartz rocks and green slates, E. 

 43° 50' N. ; Hundsriick-Taunus (chain), E. 27° 30' N. ; St. Malo, 

 Brittany, E. 42° 1 5' N. and E. 47° N. ; Schirmeck, E. 30° N. ; Saint- 

 Die, Yosges, E. 35° N. ; Montagne Noire, E. 34° N. ; Hyeres, E. 

 22° 30' N. ; and for Ajaccio, Corsica, E. 22° 30' N. 



From these twenty-two local mean directions M. Elie de Beaumont 

 proceeds to determine, trigonometrically, the direction of the great 

 circle of comparison of this system considered as passing through the 

 Binger Loch, and states the result to be the " supposition that the 

 great circle passing the Binger Loch, with a direction E. 31 J° N., 

 is the great circle of comparison, or the equator of the Westmoreland 

 and Hundsriick system." 



M. Elie de Beaumont, adopting the same methods, next examines 

 the evidence respecting the direction of the Longmynd system, one 

 formed anterior to the Caradoc sandstone. The mean local directions 

 are considered to be, for Church Stretton (Longmynd district), N. 

 25° E. ; Morlaix, Brittany, N. 21° E. ; Saint-James, Normandy, 

 N. 22° 30' E. ; Limousin, N. 26° E. ; Freiberg, Erzgebirge, N. 

 33° 57' 30" E. ; Zlabings (for Moravia and the adjoining portions of 

 Bohemia and Austria), N. 32° 30' E. ; middle distance between 

 Gotheborg and Gefle, Sweden, N. 38° E. ; Uleaborg, north-west of 

 Finland, N. 42^° E. ; Viborg, south of Finland, N. 50° E. ; and for 

 Saint-Tropez, Montagues des Maures and the Esterel, N. 35° 4 5' 4 6" E. 

 Proceeding with these means, as with those for the Westmoreland 

 and Hundsriick system, our colleague finds that the Longmynd 

 system, referred to the Binger Loch, has a direction of N. 31° 15' E., 

 differing from the former system by 27° 15'. M. Elie de Beaumont 

 supposes that, provisionally, the great circle passing by the Binger 

 Loch and making an angle of 30° 15' towards the N.E., is the equator 

 or great circle of comparison for the Longmynd system. 



Adverting to his former researches respecting the direction of 

 mountain chains, inserted in the French edition of the * Geological 

 Manual' and the ' Traite de Geognosie' of M. Daubuisson, in which 

 he notices it, M. Elie de Beaumont next considers the Finisterre 

 system, one formed anterior to the Silurian rocks. The direction of 

 this system at Brest is stated to be E. 21° 45' N., and he infers 

 that it can be found in Sweden and Finland, and that it may be pos- 

 sible to recognise it in the fundamental rocks of the Pyrenees and 

 Catalonia. The Finisterre system referred to the Binger Loch, be- 

 comes E. 11° 35' N., differing by 20° from the Westmoreland and 

 Hundsriick system, and more than 47° from that of the Longmynd. 



Under the name of the Morbihan system, a direction of beds in 

 Brittany is noticed, and considered to be due to an elevation different 

 from those described previously. This direction is taken for Vannes 

 at E. 38° 15' S., and the system itself, it is thought, may be widely 

 extended. Certain directions of beds in the departments of La Correze, 

 La Dordogne and La Cliarente are thought referable to it, as also the 

 direction of the crystalline rocks in the environs of Messina, and of 

 certain rocks in the Bohmerwald and Erzgebirge, and in the Ukraine. 



