214 Geographical Collections. 
Statistics of Mexico..The attention of our readers has been particularly turn- 
ed towards Mexico, in this number. In a work published in 1825, on that coun- 
try, Mr. Fernando Navarro says it contains a population of 6,122,354 souls, 
which is beneath Balbi’s average ; 118,478 square leagues of territory ; 242 dis- 
tricts ; 1,072 parishes ; 185 missions 3 30. cities; 95 towns; 4,682 villages ; 206 
silver mines; 1,195 meadows ; 308 convents; 4,229 priests; and more than 
5,000 monks. The entire population consists of 1,097,029 Spaniards ; 3,676,281 
Indians ; 1,338,706 of divers casts.—( National Journal. ) - 
Commerce of the Island of Mauritius.—It appears from an article on this 
subject in the Asiatic Journal, that at the epoch of which the island was occn- 
pied by the English in 1810, agriculture and commerce were in a state of com- 
plete stagnation ; five years afterwards commence had required its activity ; rich 
houses from England and from India had made establishments, and staked capi- 
tals which had doubled the prosperity of the country. But there still exists some 
restrictions which do harm to the planters, who can cultivate sugar alone, and 
though that of the island of Bourbon is of an inferior quality, France having allow- 
ed its free exportation, it sells better than the other, and ships go in preference to 
fetch their supplies at the isle of Bourbon, while commerce gradually leaves the 
harbours of Mauritius. It has cost government £100,000 annually, to keep up 
the expences of the civil and military government of the island ; for all of which 
England has only obtained in the same period, 5,000 barrels of sugar. 
Pitisburg and Philadelphia.—In 1756, Pittsburgh contained 30 huts made 
with the trunks of trees, 1 mansion of stone, 1 house of wood, and 6 little shops. 
Pittsburg now consists of 2;360 houses, churches, magazines, &c., the actual 
population of Philadelphia is 26,048 ; Nashville contains 6,000 souls.—( Nile’s 
fiegister. ) 
SSS RT RE IE DES 
NATURAL-HISTORICAL COLLECTIONS. 
Extract from the Analysis of the Labours of the Academy of Sciences during 
the year 1828; by BARon CuvieER. ( Continued from the last Number. ) 
Geology.—English and French geologists have, for some time, been studying 
with care the coasts of La Manche in comparison with those of England, which 
are opposite to them. We saw, in 1822, the table which M. Constant Prevost gave 
of the coasts of Lower Normandy. These researches have been pursued, and the 
Academy has received from M. Rozet a geognostical description of the coasts of the . 
Lower Boulonnais, from Etaples to Vissant. Some years since, Mr. Fitton, a 
learned English geologist, after many years of study, proved that this department 
is exactly similar, both in the nature of its strata and their relative position, to the 
opposite county in England. It is this proposition which M. Rozet developes ; 
but his work is full of interest from its new and numerous details, and from the 
cuts and map with which it is accompanied. The oolitic series, chalk, and their 
subordinates, principally compose this country; the strata are almost horizontal. 
A small formation, composed of marbles analogous to those of Belgium, and 
of the coals series, pierces the oolite and chalk, and shows itself in strata almost 
vertical, which has been converted to very useful purposes. Caps of a tertiary 
sandstone crown the chalky heights; and in the lowest parts, alluvia of various 
ages conceal the different rocks. And lastly, the sands of the sea assume the 
form of downs, advancing with a tardy step, in the direction of the prevailing 
winds. 
