What is "the most feck"

Feck \Feck\, n. [Abbrev. fr. effect.]

1. Effect. [Obs.]

2. Efficacy; force; value. [Scot. & Prov. Eng.]

3. Amount; quantity. [Scot. & Prov. Eng.]

   He had a feck o' books wi' him.
   --R. L. Stevenson.

   The most feck, or The feck, the greater or larger part. ``The feck o' my life.''
   --Burns.