508 On the Nervous Systems of 
brain has in various instances been very exten- 
sively injured and diseased, that it has been near~ 
ly,.perbaps wholly, ,destroyed,.as in the very 
extraordinary.case, copied above from Dr, Quin’s 
Treatise on. the Dropsy of the Brain,t without 
destroying sensation or voluntary motion, some 
; doubts must, I think, arise in his mind as to the. 
justness of such an inference, because he will 
perceive, that the neryous system of man in its 
entire and diseased states is governed by different 
laws. 
Again, when he reflects upon the amazing 
diversity of structure, proportion, disposition 
&c, observed in the nervous systems of different 
‘orders of animals, from man to a zoophyte, and 
attends carefully to the various tenures, on 
which sensation and voluntary motion are held by 
the animal creation ; he will find further reason 
for questioning the propriety of the ground, on 
which the possession of these two important 
faculties is denied to a human fetus, unfortunately 
labouring under the privation specified above; 
For he will be led to suppose, that its nervous 
system may be governed by the same laws as that 
of the inferior animals, which it more nearly 
xesembles than the nervous system of its own 
species in the natural state, 
+ Sce page 489. 
