434 Scientific Intelligence. 
admit it with us, the partisans of fizity have been forced to conclude 
against their own principle. 
a simple and rational hypothesis, that of jiliation ; to the doctrine of 
fixity, two hypotheses equally complicated and improbable, that of succes- 
ular cases, e of 
13.) Moreover, it is confirmed by various considerations in presence 
which it seems difficult to maintain the other two hypotheses. Without 
insisting on that of successive creations, we shall confine ourselves sagt 
cing here in opposition, in two of their consequences, the rypothesis © 
Jiliation and that of translation. 
(14.) According to the first, the existing animals should be descended 
from — 
(15.) In the hypothesis of fidiation, the number of species ep ee 
sequently, t possible com, 
Then, according to this hypothesis, the number of animal and vege 
Species ave gone on constantly decreasing ; 
* Which has been demonstrated in the Course of Lectures of 1847. 
