Institute of France. 393 
of Geology, and on the Use which may be made of them. By 
John Hawkins, Esq. F.R.S. Honorary Member of the Society. 
On Stratification, and on the external Configuration of the 
Granite of Cornwall. By John Forbes, M.D. Secretary of the 
Society. . 
On the Gwithian Sands. By Henry Boase, Esq. Treasurer of 
the Society. 
On the Slaty Rocks of Cornwall, more particularly on those 
usually denominated Killas. By Dr. Forbes. 
Additional Observations on the Temperature of Mines. By 
R. W. Fox, Esq. Member of the Society. 
Notice on the Geology of Nice. By G. C. Fox, Esq. Member 
of the Society. 
Some Account of the South American Mines. By the Rev. 
John Trevenen. 
Some Account of the Mines of Pasco, in South America. By 
Mr. Richard Hodge. Communicated, with additional Obser- 
vations, by Sir Christopher Hawkins, Bart. M.P. F.R.S. Member 
of the Society. 
Some Account of the external Features (natural and artificial) 
of a Country, from which its Geological Structure may be in- 
ferred. By Dr. Forbes. 
Notice of the Quantity of Copper raised in Great Britain and 
Ireland in the Year ending June, 1821. By Mr. Alfred Jenkyn, 
Member of the Society. 
Notice of the Quantity of Tin raised in Cornwall in the Year 
ending June, 1821. By Joseph Carne, Esq. F.R.S. 
INSTITUTE OF FRANCE. 
SYNOPSIS OF GEOGRAPHICAL RESERCHES RESPECTING THE IN- 
TERIOR OF NORTHERN AFRICA, BY M. WALCKENAER,. 
The task assigned to the author by the Academy was to ex- 
amine an itinerary from Tripoli to Timbuctou, translated by a 
French Morocco consul from the Arabic of the Cheyk-Hagg- 
Cassem ; this was an aged agent that served as a guide to the 
caravans in their journeys to Timbuctou. 
M. Silvestre de Sacy being in possession of another itinerary 
from Tripoli to Timbuctou, written in the vulgar Arabic, trans- 
lated it at my request. ‘The annexed words by the author, ter- 
minate his itinerary: “ Composed by me, Mohammed, the son 
of Ali, the son of Foul; my father was afree citizen, my mother 
a black slave; my country is Teraoubez and Tomboctou.” 
These two itineraries are of considerable importance for the 
geography of Africa, and J intend to publish them *, accompanied 
* It has not yet appeared, but is araunced as on the eve of publication. 
with 
