New original cover art included with this eBook is granted to the
public domain.
Pg. 19 - Corrected typo: '... primarily to the central nervous sytem' >
'system'
Pg. 125 - Corrected typo: missing period: '... as reflected in its
language'
Pg. 235 - Corrected typo: '... concious of the cosmic problem' >
'conscious'