Various, Notes and Queries, Number 184, May 7…
“ The Greek benediction is given with the forefinger entirely open; the middle finger slightly bent, the thumb crossed upon the third finger, and the little finger bent.In the present day, however, in the Latin Church, a person making on himself the sign of the cross, employs the right hand entirely open, instead of three fingers only. And as it has been thought desirable to make a distinction between the benediction given by a bishop and a priest, bishops reserved to themselves the right of blessing with three fingers; and priests give the benediction with the hand entirely open. ”
