306 Baron Cuvier on the Physiological Labours 
tinued from the old, and requires for its formation that.the 
jymph from which it is produced should be maintained in its 
position either by the scab or some other means, ‘The entire 
portion of brain removed is not regenerated, but a cicatrix is 
formed upon the cut surface. A simple division is repaired 
by reunion. The superior part of the ventricle, when re- 
moved, is repaired by a production from the margins of the 
remaining part. Finally, as we have observed in 1822, the 
animal recovers by little and little its faculties as the parts ci- 
catrize, at least they do so if the injury has not been very 
reat. 
M. Majendie has also made many experiments respecting 
the functions peculiar to the different parts of the brain, and 
has communicated to the Academy one of the most remarkable, 
which in every respect corresponds with one made on the ce- 
rebellum by M. Flourens, and which serves as a support to it.’ 
When the great commissure of the. cerebellum (pons varolit) 
is divided anterior to the origin of the 5th pair of nerves, the 
animal loses all power of supporting itself on its four limbs; 
it falls on the side upon which the division has been made, and 
rolls over and over during entire days, ceasing only when pre- 
vented by some obstacle. The harmony in the motion of its 
eyes is also destroyed; the eye of the injured sideis irresistibly 
directed downward, while that of the opposite side is turned 
upward. A Guinea pig thus treated turns over and over sixty 
times in a minute. This rotatory movement is produced by 
division of one of the crura cerebelli, but if both be divided the 
animal remains without motion; the equilibrium of these two 
organs being as essential to the repose as to the regular move- 
ments of the animal. Similar phenomena are exhibited when 
the cerebellum itself is divided from above downward. If 
three quarters of it be left on the left side, and one quarter on 
the right, the animal turns over to the right, and its eyes are 
distorted as stated above; a similar section leaving the one 
quarter on the left side re-establishes the equilibrium, but if 
leaving the quarter on the right untouched it is cut on the left 
down to the crus, the animal turns to the left, or in other words 
it turns to the side where least is left. A vertical section of 
the cerebellum puts the animal into an extraordinary condi- 
tion : its eyes appear to project from the orbit; it leans some- 
times to one side and sometimes to the other; its limbs are 
stretched out as if it endeavoured to go backward. M. Ma- 
jendie quotes an observation of M. Serres, which proves that 
the same effects might take place in the human subject ; an in- 
dividual after excessive drinking was seized with a propensity 
“to turn over and over, which continued till death; on dissec- 
tion 
