. . . . . . . "A rationale of the laws of cerebral vision comprising the laws of single and of wect vision, deduced upon the principles of dioptries" . . . . "A Rationale Of The Laws Of Cerebral Vision : Comprising The Laws Of Single And Of Erect Vision, Deduced Upon The Principles Of Dioptries" . "A rationale of the laws of cerebral vision; comprising the laws of single and of erect vision, deduced upon the principles of dioptrics" . . . .