[B101]

Feb 2/69/ After reading Maudsley I think instincts are not connected with intellectual power, but these are gradually superadded & necessarily tend to destroy the perfection of instinct. If a set of nerve-cells have only afferent & efferent fibres & connecting fibres, the proper stimulus will set the number all into harmonious working - but if these same cells are connected with a vast number of fibres preceding from the intellectual parts of Brain, the simplicity of the wall will naturally be lost - instincts are lost at the expense of that gain of high intellectual powers - excepting a few necessary instincts.

(Instinct)

[101v]

[Although] we know nothing of the membranes of the brain, it appears almost inevitable that when all the parts are connected together by the the most intricate channels of communication, any one part would be less likely to answer in a uniform manner to particular sensations or association