Plain Facts for Old and Young by John Harvey Kellogg

16. _Confusion of ideas_ is another characteristic of the devotee of

this artful vice. If he attempts to argue, his points are not clearly made. He may be superficially quick and cute, but is incapable of deep thought, or abstruse reasoning; is often very dull of apprehension. Ideas are not presented in logical order, but seem to fall out promiscuously, and fairly represent the condition of a disordered brain. Attempts at joking are generally failures, as the jest is sure to be inappropriate or vulgar, and no one but himself sees any occasion for laughter except at his stupidity. Such individuals are not scarce.