Different Animals, €9c. 509 
When he finds a mother, describing the motions 
of a fetus in utero, which happens to be still- 
born and is, after its birth, proved by dissection 
to have neither brain, nor spinal marrow, as 
exactly similar to those of her former perfect 
children, he surely can entertain no doubt, that 
this fetus, when alive, possessed the same power of 
Voluntary motion; And, as this faculty, as well 
as sensation, is derived from the nervous system, 
he will see a strong reason for believing, that this 
same fetus also possessed sensibility. 
Further, when he finds one of these defective 
beings ushered into the world alive and exhibit- 
ing, as far as can be determined, the same powers, 
which a perfect child of the same age displays, 
crying when touched rudely, moving its limbs 
with agility and swallowing food, living more than 
five days, and then dying with an incipient mor- 
tification of the head, he cannot, I apprehend, 
reasonably withhold his assent to this child’s 
possessing the faculty of sensation as well as that 
of voluntary motion —Who will contend, that 
this child could not feel, because it had no sen- 
sorium commune? Who does not perceive, that 
the encephalon and sensorium commune are not 
exactly‘synonymous terms and consequently not 
always to be used indiscriminately in speaking of 
the animal faculties? : 
In one of these two cases I have no doubt, 
