on which the action of the heart depends , &c. 89 
bowels obeys the same laws as the action of the heart. It 
appears from those experiments, that this motion is wholly 
independent of the nervous system. It continues till the parts 
become cold after the brain and spinal marrow are removed. 
I have already mentioned the circumstances which prevented 
our positively ascertaining, whether it is influenced by stimuli 
applied to the brain and spinal marrow, (Exp. 17.) but we 
know that the action of the bowels is frequently influenced 
by affections of the mind. 
From the whole of the foregoing experiments and obser- 
vations, it appears, 
1. That the muscles of involuntary motion obey the same 
laws with those of voluntary motion. Exp. 1, 2, 3, 4, 5, 6, 
7, 8, 10, 11, 12, 13, 14, 15, 16, and 17, compared with Exp. 
18, and 19 ; see also observations under Exp. 19. 
2. That the apparent difference in the nature of these 
muscles, arises from their being under the influence of diffe- 
rent stimuli ; see observations under Exp. 1 9. 
3. That they are both capable of being stimulated through 
the nervous system. Exp. 12, 13, 14, 15, 16. 
4. That the power of both is independent of the nervous 
system. Exp. 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 17, 18, and 19. 
5. That what is called the nervous system consists of two 
parts, whose existence is not immediately dependent on each 
other ; the one performing the sensorial functions, the other 
conveying impressions to and from the sensorium, and, with- 
out bestowing any power on the muscular system, acting as a 
stimulus to it. See the observations under Exp. 19. See also 
Exp. 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 18, 19. 
N 
MDCCCXV. 
