FUNCTIONS OF THE CEREBRUM. 535 



in an equal degree, but could not permit one faculty to 

 be strongly and another weakly manifested. 3. The 

 plurality of organs in the brain is supported by the phe- 

 nomena of some forms of mental derangement. It is not 

 usual for all the mental faculties in an insane person to be 

 equally disordered ; it often happens that the strength of 

 some is increased, while that of others is diminished ; and 

 in many cases one function only of the mind is deranged, 

 while all the rest are performed in a natural manner. 4. 

 The same opinion is supported by the fact that the several 

 mental faculties are developed to their greatest strength at 

 different periods of life, some being exercised with great 

 energy in childhood, others only in adult age ; and that 

 as their energy decreases in old age, there is not a gradual 

 and equal diminution of power in all of them at once, but, 

 on the contrary, a diminution in one or more, while others 

 retain their full strength, or even increase in power. 5. 

 The plurality of cerebral organs appears to be indicated 

 by the phenomena of dreams, in which only a part of the 

 mental faculties are at rest or asleep, while the others 

 are awake, and, it is presumed, are exercised through 

 the medium of the parts of the brain appropriated to 

 them. 



These facts have been so illustrated and adapted by 

 phrenologists, that the theory of the plurality of organs 

 in the cerebrum, thus made probable, has been commonly 

 regarded as peculiar to phrenology, and as so essentially 

 connected with it, that if the system of Gall and Spurzheim 

 be untrue, this theory cannot be maintained. But it is 

 plain that all the system of phrenology built upon the 

 theory may be false, and the theory itself true ; for phre- 

 nologists assume, not only this theory, but also that they 

 have determined all the primitive faculties, of which the 

 mind consists, i.e., all the faculties to which special 

 organs must be assigned, and the places of all those 

 organs in the cerebral hemispheres and the cerebellum. 



