Walter Howard Frere,
Dictionary of National Biography…
(1912)
“ Procter's liturgical work was careful and scholarly; his text-book followed the lines of sound exposition laid down by Wheatley and his followers, and his edition of the 'Sarum Breviary' was the most notable achievement of an era which was first developing the scientific study of medieval service-books. A portrait painted by an amateur is in the possession of his son. ”

