$08 Baron. Cuvier o7 the Physiological Labours 
the back of the;head it is unimpaired-as in other parts of the 
body. The most irritating chemical agents will not produce 
tears; the eyelids and iris become immoveable; one might even 
suppose the eye to be artificial. After some time the cornea 
becomes white and opaque, the conjunctiva and iris inflame 
and suppurate, and finally, the eye shrinks into a small tuber- 
ele, which fills only a small part of the orbit, and its substance 
resembles newly coagulated milk. In this state the animal is 
no longer guided by its whiskers, as it should: if merely de- 
prived of sight; it advances with the chin resting on the ground, 
and pushing its head before it; the tongue is equally insensi- 
ble, and hangs out of the mouth; sapid bodies appear to have 
no apparent effect on its anterior part, although they exert 
their influence on its centre and base. The epidermis of the 
mouth thickens and the gums separate from-the teeth. .The 
author even thinks, that he has observed that the sense of 
hearing is lost by the division of the fifth pair, which if cor- 
rect, shows that all the senses are under the influence of this 
nerve. It has long been known that it was in the lingual 
branch of the fifth pair that the sense of taste essentially re- 
sided, and more recently the experiments of Mr. Bell prove, 
that the sensibility of the face depends upon the numerous 
branches of this nerve distributed upon it, but those distri- 
buted to the nose, eye, and ear, were not considered equally 
essential to the integrity, or even to the perfect exercise, of 
the senses of smell, sight, and hearing, as has been shown by 
M. Majendie. The details of these experiments, and of others 
not less interesting, may be found ima journal of physiology, 
of which the author publishes four numbers in the year, and 
where he collects whatever is founded on positive facts, esta- 
blished by accurate observations. 
M. Flourens has also endeavoured to apply his method of 
successive removal to determine the use of the different parts 
of the ear. We know that this complicated organ is com- 
posed in warm-blooded animals of an external passage leading 
to the membrane of the tympanum, which forms the entrance 
into a second cavity named tympanum or box,:and from which 
a chain of bones commences, the last of which, the stapes, is 
applied to the fenestra ovalis, or entrance of the second cavity 
called vestibule, into which three canals called semicircular 
canals and one of the orifices. of a third cavity of a spiral form 
called cochlea open, the other orifice of the cochlea opening 
immediately into the tympanum by the fenestra rotunda. There 
are also mastoid cells formed in the substance of the bone, 
which communicate with the tympanum, and a canal called the 
fallopian 
