The Collaborative International Dictionary of English v.0.48:

Emforth \Em*forth"\, prep. [AS. em-, emn-, in comp. equiv. to
   efen equal + for[eth] forth.]
   According to; conformably to. [Obs.] --Chaucer.
   [1913 Webster]

   Emforth my might, so far as lies in my power. [Obs.]
      [1913 Webster]