1054 Influence of circumstances on the Actions of Animals. 
superior portion of the léss mantle is in many respects very similar 
to analogous changes superficially in the aspect of the residuary clays 
over certain parts of the driftless area lying in the northeastern por- 
tion of the state, and the contiguous parts of Illinois and Wisconsin 
—more specifically referred to by Chamberlain and Salisbury ;1 (3) 
that the stratigraphic rocks bordering the Mississippi river suffered 
considerable abrasion during the sojourn of the glacier, as is attested 
by numerous larger fragments of flint and limestone, which are 
manifestly not far removed from their origin, and also by the 
observed surfaces of striation over the elevated portions of the area 
cartographically represented by fig. 1; and (4) that the till which 
on the retreat of the glacier nearly, if not entirely, filled preglacially 
corraded channels has since been more or less completely removed 
from the numerous deep ravines occurring on all sides of the ele- 
vated plateaus of the region. 
ON THE INFLUENCE OF CIRCUMSTANCES ON THE 
ACTIONS AND HABITS OF ANIMALS, AND 
THAT OF THE ACTIONS AND HABITS 
OF LIVING BODIES, AS CAUSES © 
WHICH MODIFY THEIR 
ORGANIZATION. 
BY J. B, P. A. LAMARCK.? 
(Continued from page 972.) 
Ngee which proves it, is that this is not true of the organ of 
hearing, which is always found in animals where the 
nature of their organization requires it. This is the reason. 
The material of sound, that which is moved by the shock or 
' vibrations of bodies, transmits to the organ of hearing 
impression which it has received from them, and penetrates every- 
where, traversing all media, and even the masses of the most solid 
1 U. S. Geol. Sur., Sixth Ann. Rep. 
* Translated by Dr. E. E. Galt, from the edition of 1809. 
