i82 Human Personality. 



In the case of a colony of unicells, combining for a com- 

 mon life, the resultant consensus of cell lives is a simple 

 one, differing little, save in volume, from that of any one 

 of the component cells. In the human personality — not 

 differing in. principle — we have the consensus of cell 

 lives extensively developed. The cells of the optical tract, 

 for example, are stored with scenic impressions that come 

 to them through the apparatus of the eye ; yet do these 

 stand connected, sentient and perceptive, with every other 

 cell of the brain, and flash to each their pictures of the 

 external world. In like manner the cells of the auditory, 

 olfactory, and gustatory tracts transmit to the entire 

 aggregate of cells with which they are in touch, sensations 

 of sounds, flavors, and odors of which they are the recipi- 

 ents. From the sympathetic system, from the heart, the 

 ■lungs, and the other organic apparatuses, as also from the 

 peripheral nerve cells, come constant tides of sensation 

 which impress every cell in the brain. So extended and 

 perfect is the mechanism of contact that each distinct im- 

 pression from the external world, or from the different 

 organs of the body, is flashed to, and pervades the whole 

 unified group of neurons. In greater or less degree they 

 all take part, although the organized division of labor has 

 delegated to the motor neurons the function of response. 



To trace the education of brain and describe the de- 

 velopment of intellect from the interaction between the 

 sentient fabric of cells within the cranium, and the external 



