Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. You ask me how can I prove that I am right in my confidence that I can see. My answer 18 because I see something which is positive. There are others who affirm that they see something contrary. It only proves that I am looking on the picture side of the canvas, and they on the blank side. There fore my short view is of more value than their pro longed stare.