930 
CATALOGUE RAISONNE. 
_ Mesures Barométriques, suivies de quelques Observations d’ His- 
toire Naturelle et de Physique, faites dans les Alpes Francaises, 
et. dun precis de la Meteorologie d’Avignon ; par J. GUERIN, 
M.D. &c. 1 vol. 12mo. Avignon, 1829. 
This little werk contains a great number of useful data, judiciously col- 
lected, upon the aspect and climate of the French Alps. It is not sus- 
ceptible of analysis, because all its pages contain numbers. Thereisa ba- 
rometric levelling of the greater part of the Dauphine, of Provence, and 
of the department of Avignon, including roads, rivers, mountains, and 
all the remarkable spots in the country. 
The mean inclination of the Rhone from Geneva to the sea, is about 13 
French feet to the league: that of the Isere, from Grenoble to the Rhone, 
about 4 feet. 
A great number of observations, made in different seasons on the Mount 
Ventoux, an isolated and conical mountain, whose summit is elevated 
more than 2000 yards above the level of the sea, have shown to the au- 
thor, that in latitude 44°, and to a height of 2000 yards, the tempera- 
ture of the atmosphere decreases in summer one centesimal degree for 
160 yards in elevation, and one degree in winter for 200 yards, and the 
Same quantity for 180 iu the intervening seasons. 
As a proof of the cooling effects produced in solid bodies by radiation in an 
open atmosphere, Mr. Guerin has found, by very delicate observations, 
that the temperature of trees and plants is often very much below that 
of the air. The 24th January 1827, at seven o’clock in the morning, the 
air being at —11°,3 cent. snow adhering to the branches of the cypress, 
and to other plants and shrubs, it was at —14°,5 and 15°, that is to say 
30°,5 more than the atmosphere. In 1828, the temperature of the 31st 
of March, and of the Ist of April, which was for the trees and flowers 
—2°,5, was for the air only + 1°,5. 
The mean temperature of Avignon, obtained by twenty-seven years of ob- 
servations, is + 11°,5 Reaumur, (14°,38 cent:) The elevation of the ba. 
rometer, from a mean of ten years, is 28 in. 1,8 lin. or 762 mill. The 
annual quantity of rain, from a mean of twenty years, is 20 in. 3,8 lin. 
Those who take an interest in meteorological science, and in physical 
geography, will be anxious to obtain, on the different countries of the 
globe, data as complete as those which Mr. Guerin furnishes upon the 
country which he inhabits. 
Viaggi in Asia, in Africa, nel Mare delle Indie. Travels in 
Asia, in Africa, and the Indian Seas ; written in the 13th century 
by Marco Potro, Venetian. Ry B. Gampa. Venice, 1829. 
The author of this edition of Marco Polo’s travels, has undertaken to ren- 
der a service to history, to geography, and to the Italian language. Mo- 
dern travellers, and those who devote theniselves to the study of geogra- 
phical science, have long felt the great importance of narratives so exact 
and .so impartial as those which Marco Polo has left us of his travels. 
We are indebted to the Count J. B. Baldelli for a beautiful edition of 
this work in four vols. 4to. and Mr. Gamba has formed the project of 
publishing a less voluminous and more convenient edition. He has con- 
fined himself solely to the addition of those notes and explanations which 
are indispensable to its comprehension ; and he will terminate by some 
very brief notes upon the author, and the work, and by explanations 
which were actually necessary. 
General Observations on Univalves. By Cuaries CoLui=R, 
Esq. Staff-Surgeon at Ceylon —Edin. New Phil. Journ. No. XIV. 
Oo 
p. 220. 
