132 Geological Society. 



Read " Descriptions of three new species of Plants, natives of 

 New Granada, by M. Gondot, Professor of Botany at Bogota : the 

 plants are, 



1 . Sessea corymbjfiora foliis obovatis attenuatisque, floribus corym- 

 bosis. — In woods near Bogota. 



2. Cinchona Muzonensis foliis ovato-oblongis acutis basi attenuatis, 

 stipulis revolutis, panicula brachiata, corollis albis, limbo imberbi. 

 — In great forests near the city of Muzo. 



3. A plant of a Genus nearly akin to Theobroma, from which it 

 differs chiefly in habit, in the form of the calyx, and the structure of 

 the stamens. Monadelphia Dodecandria. Bu'ttneriocce, Brown. "Ar- 

 buscula foliis digitatis, quinatis." — Forests near Muzo. Called by the 

 inhabitants the Cacao Montaras or Symoron. The poor people mix 

 the fruit with the cultivated cacao. 



GEOLOGICAL SOCIETY. 



Dec. 7. — John Braddich, Esq. of Boughton -Mount near Maidstone j 

 G. VV. Featherstonhaugh, Esq. of Duanesburgh, New York ; Arthur 

 Kett Barclay, Esq. of Grosvenor Place ; and Lord Francis Leveson 

 Gower, of Albemarle Street, were elected Fellows of the Society. 



A paper was read, " On the Geology of Quebec and its Vicinitv, 

 by J. T. Bigsby, M.D. F.L.S. G.S." &c. &c. 



The author, who acknowledges the assistance he has derived from 

 the manuscripts of Lieut. Skene, R. E., first describes the tract, on 

 the eastern termination of which the city of Quebec is situated, as an 

 oblong ridge of about seven miles and a half in length, and in aver- 

 age width about one mile and a half; subsiding on the north-west 

 by steep and rocky slopes, into rich meadows j whilst on the south- 

 east it advances in the form of cliffs towards the northern bank of 

 the St. Lawrence. 



Various rivers traverse the district above mentioned, nearly from 

 north to south, of which the most considerable are the St. Charles 

 and the Montmorenci. On the southern bank of the St. Lawrence, 

 Point Levi is the most conspicuous promontory ; and to the west of 

 it the country is intersected by several streams running from south to 

 north. 



Diluvium. — The districts above mentioned are partially covered 

 with boulders of gneiss, granite, syenite, and labrador felspar 5 the 

 greatest quantities of which are found on and near Cape Diamond, 

 Point Levi, and Point Montmorenci j whilst occasional deposits of 

 clay, gravel, and sand, including organic remains, the author supposes 

 to be of diluvial origin, — and not produced by the operation of any 

 existing watercourses. 



The rocks of this region repose upon each other in the following 

 descending order: — 1st. A slaty series, composed of shale and grau- 

 wacke, occasionally passing into a brown limestone, and alternating 

 with calcareous conglomerate in beds, some of which are charged 

 with fossils. — 2nd. A conchiferous brown and black limestone some- 

 times based upon a calcareous conglomerate. — 3rd. Gneiss. The 

 author's chief reason for considering the slaty-6eries as superior to the 



limestone, 



