LECTURE IX. 

 ON SENSORIAL VISION.* 



.OM what I have understood respecting the 

 objects of this Institution, as one equally 

 addressing itself to the cultivation of Phil- 

 osophy and Literature, I am led to believe 

 that the subject which I propose to bring before it, in 

 compliance with an invitation which I feel to be both 

 honourable and gratifying in no common degree, is one 

 not altogether foreign to them ; inasmuch as the history 

 of vision has both a strictly scientific and a more abstract 

 and philosophical bearing; the one referring itself to 

 material, the other to mental science. The one regards 

 only the means and adaptations by which we see, and the 

 other refers to the action of the mind itself in seeing, that 

 is, in interpreting the impressions produced on our visual 



* This lecture was delivered before the Philosophical and Lite- 

 rary Society of Leeds, on the 3Oth September 1858, at the request 

 of that society. 



