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Dr. Frederick Walker Mott 



[April 21, 



minute structure of the brain is truly a most elaborate microcbemical 

 study, and we can test the condition of the tissues of the body by 

 their colour reactions, on the same principle that the chemist tests 

 fluids by colour reactions in his test tube. 



Before proceeding further, however, I feel that my remarks will 

 be more intelligible if I point out some of the more important 

 features in the general anatomy of the brain. 



DIAGRAM or NERVOUS ELEMENTS or GREY NATTER of 5RMW. 



Fig. 1. 



Diagrammatic representation of the Cerebral Cortex, showing the neurones 

 with their processes, also sensory ingoing, motor outgoing, and associatiou fibres; 

 after Foster. 



If you look at a series of brains of vertebrates you will observe 

 that as you rise in the zoological scale the brain becomes more and 

 more complex in structure, until in man it reaches its highest 

 degree of complexity. Yet, architecturally speaking, these brains 

 are all built on the same general plan, and at one time during its 

 development the human brain was as simple in structure as that of a 

 bird or fish. Moreover, the microscopical nervous units which make 

 up the structure of the brain of all vertebrates are constructed on a 



