Transcriber's Note:

Minor punctuation errors have been corrected without note. Inconsistent hyphenation has not been changed.

The following corrections were made to the text:

p. 17: contantly to constantly (constantly enlarging and more comprehensive)

p. 24: admiting to admitting (even while admitting)

p. 24: which which to with which (with which it is used)

p. 28 (Footnote 2): contraint to constraint (Freedom and constraint)

p. 30 (Footnote 3): acton to action (all volitional action)

p. 34: Maudesley to Maudsley (says Dr. Maudsley)

p. 41: missing "from" added (shall be expelled from our)

p. 58: occured to occurred (occurred in the past)

p. 86: absurdem to absurdum (argument ad absurdum)

p. 98: condiitons to conditions (certain conditions, circumstances)

p. 107: Hamiliton to Hamilton (Sir William Hamilton)