reproduces them in subjective sensations and ideas ; (4) 

 manifests itself in its higher and peculiarly human emotions 

 and feelings, and in its faculties of judgment, understand- 

 ing, memory, reflection, induction, and imagination. The 

 organs, therefore, in and through which the mind acts in all 

 these operations are the cerebral hemispheres. 1 The facul- 

 ties into which the intellect has long been divided consist of 

 memory, reason, imagination, conception, and others ; but, 

 as Professor Bain observes, these are not fundamentally 

 distinct processes, but merely different applications of the 

 collective forces of the intelligence. Still, although we may 

 have no power of memory in radical separation from the 

 power of reason, or the power of imagination ; and as this 

 classification of the faculties is, however, otherwise objection- 

 able, at least familiar, and therefore all the more easily 

 comprehended, I shall more or less adhere to it in con- 

 sidering the heredity of intelligence. 



Memory consists in the fact that an image once formed in 

 the brain produces an indelible impression, and may at any 

 future time recur. In other words, " every sensory impres- 

 sion which has been once recognised by the perceptive 

 consciousness is registered in the cerebrum, and may be 

 reproduced at some subsequent time, although there may be 

 no consciousness of its existence in the mind during the 

 whole intermediate period." 2 The terminations of the 

 nerves centrally in the brain are in the grey matter, which is 

 abundantly supplied by blood-vessels. The nervous tubes 

 terminate in contact with cells, in which probably the changes 

 occur which cause the registration of impressions of the 

 external world, and from which their reappearance occurs to 



1 "Kirkes' Physiology." 



2 Dr. Carpenter. 



