PHYSIOLOGY AND PATHOLOGY OF THE BRAIN. 635 
sensitive fibres in the nerves, and reflected to the motor column, whose 
filaments transmit them to the muscles acted on. 
“From this it follows that, 
“ 7. Voluntary and involuntary associated movements are occa- 
sioned by stimuli, the influence of which is conveyed by nervous 
fibres to the part acted on, — but that, in the one case, the sti- 
mulus is mental, in the other, chemical or mechanical. 
“The movements termed exeito-motory are of the latter class.” 
Dr. Bennett next proceeds to the explanation of numerous 
physiological and pathological phenomena afforded by this new 
explication of the nervous system. For this we must refer to 
the work itself, premising that the student will be gratified and 
instructed. 
The work reflects the highest credit on our medical debutant, 
and is a pledge that the degree which he sought was well and 
worthily bestowed upon him. The subject on which he treats 
occupies a common ground between the two professions, and 
many of his illustrations are borrowed from comparative physio- 
logy. We cordially recommend it to the perusal of the veterinary 
practitioner, and of the veterinary student, too, when he has 
obtained sufficient anatomical, and physiological, and pathologi- 
cal knowledge properly to understand and appreciate it. We 
admire his concluding remarks ; but he underrates his own 
powers, and the well-founded expectations of his medical 
brethren. 
“ I cannot conclude without remarking, that our knowledge 
of the nervous system has now made such rapid progress, that 
the nomenclature connected with it requires revision and 
alteration. The student is confused by the different meanings 
applied to the same words, the immense number of theories 
advanced, and the numerous circumstances to take into account 
before the most simple effect can be satisfactorily explained. 
Those also whose knowledge keeps pace with the progress of 
science, must see the inconsistency of many terms in general 
use ; and the difficulty of expressing concisely the various 
actions attributed to different portions of the nervous system. I 
am conscious, however, that this great revolution in physiology 
is not to be accomplished by any feeble efforts of mine. It 
requires some mighty magician, whose wand is sufficiently 
powerful to break through the chains which time and custom 
have placed around this beautiful study ; whose penetration is 
able to detect the fallacies and unfounded speculations with 
which it is encumbered ; and whose genius and intellectual 
superiority will enable him to arrange the heterogeneous materials 
