CONSCIOUSNESS AND SENS A TION. 99 



enter into a complicated ganglion most developed 

 in the part where vision is clearest, and it would 

 be very hard to imagine that the fibres of the 

 optic nerve emerging from the ganglionic corpus- 

 cles correspond individually with distinct rods or 

 cones. 



These being the objections to the received 

 theory of sensation, they appear to me to warrant 

 search for an escape from them, and I have been 

 led, by the consideration of the properties of the 

 living corpuscles of the body, and of what appear 

 to me the established facts with regard to the 

 actions of the cerebral hemispheres, to a hypothesis 

 which I venture to put forward, believing it to 

 furnish that escape, and to be in harmony with 

 all that is known of the nervous system. 



But before doing so, I find it necessary to ex- 

 plain and defend the view which I hold with 

 regard to the connection between mind and brain, 

 and which I have already in a few words suggested 

 in a paper on the structure of the cerebral convo- 

 lutions in the Quarterly Journal of Microscopical 

 Science (April, 1870.) We must inquire into the 

 relations of consciousness with the hemispheres 

 before we ask how it is brought into communi- 

 cation with the finger-ends. 



The cerebral hemispheres, which are well ascer- 



