Botany and Zoology. 431 
ison of different countries in respect to those natural orders which 
abound most in species; and Chap. 23, as regards their most characteristic 
natural families. Chap. 24, on the variety of vegetable forms in different 
countries and in the world at large, i.e. the probable number of species ; 
e proportion of genera to species, and of orders to genera and species, 
Chap. 25, the division of the earth’s surface into natural botanical regions. 
Chap. 26, sketch of the vegetation of different countries in respect to the 
probable origin of their existing species, &c. 
The Fourth Book, of a single brief chapter, consists merely of a sum- 
mary of the author's general conclusions. We give these entire, for con- 
venience availing ourselves of a translation in Hooker's Journal of Botany.* 
“The plants now inhabiting the globe have survived many changes, 
geological, geographical, and, latterly, historical. The history of their 
distribution is hence intimately connected with that of the whole vege- 
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table kingdom. 
To explain existing facts, it is fortunately unnecessary to adopt any 
conclusion upon the most obscure hypotheses of Cosmogony and Palz- 
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aternary, (that which preceded the existence of man in Europe, an 
which rari the latest elevation of the Alps), has lasted many thou- 
years, during which important geographical and physical changes 
of the globe have suffered no change, or have been exposed to a different 
series of changes. 
“Thus the a facts of Geology and Paleontology, reduced to the 
Most general and incontestible, suffice to explain the facts of Botanical 
Geogr aphy, or at least to indicate the nature of the explanation, which it 
Tequires the progress of many sciences to complete. | 
SPOILS peers a RET REPT ee ON ae ee ee Og a Se | eee Tee Te EE ren Pp SSR de ie 
i i ice of De Can- 
# We take this occasion to commend to our readers the detailed notice o} an 
dolle’s work, given last spring, and summer, in a series of the numbers of Hooker's 
Journal. It comprises a careful abstract of these volumes, and a critical commentary 
Upon man ing i original remarks. 
have affected Europe and some neighboring countries, whilst other regions ~ 
