Source : Webster's Revised Unabridged Dictionary (1913)

Along \A*long"\ [AS. gelang owing to.]
   (Now heard only in the prep. phrase along of.)

   {Along of}, {Along on}, often shortened to {Long of}, prep.
      phr., owing to; on account of. [Obs. or Low. Eng.] ``On me
      is not along thin evil fare.'' --Chaucer. ``And all this
      is long of you.'' --Shak. ``This increase of price is all
      along of the foreigners.'' --London Punch.