“Oh, I beg you will not mention that, or refer to anything at all I have said to you. I assure you it pains me very much, and you know I have apologised once or twice already.”

“Oh, it isn’t that. The apology should come from me; but I thought I would like to explain why it is that I did not take your picture, as you thought I did.”

“Not take my picture? Why I saw you take it. You admitted yourself you took it.”

“Well, you see, that is what I want to explain. I took your picture, and then again I didn’t take it. This is how it is with amateur photography. Your picture on the plate will be a mere shadow, a dim outline, nothing more. No one can tell who it is. You see, it is utterly impossible to take a dark object and one in pure white at the instantaneous snap. If the picture of the falls is at all correct, as I expect it will be, then your picture will be nothing but a shadow unrecognisable by any one.”

“But they do take pictures with the cataract as a background, do they not? I am sure I have seen photos of groups taken at Niagara Falls; in fact, I have seen groups being posed in public for that purpose, and very silly they looked, I must say. I presume that is one of the things that has prejudiced me so much against the camera.”

“Those pictures, Miss Sommerton, are not genuine; they are not at all what they pretend to be. The prints that you have seen are the results of the manipulation of two separate plates, one of the plates containing the group or the person photographed, and the other an instantaneous picture of the falls. If you look closely at one of those pictures you will see a little halo of light or dark around the person photographed. That, to an experienced photographer, shows the double printing. In fact, it is double dealing all round. The deluded victim of the camera imagines that the pictures he gets of the falls, with himself in the foreground, is really a picture of the falls taken at the time he is being photographed. Whereas, in the picture actually taken of him, the falls themselves are hopelessly over-exposed, and do not appear at all on the plate. So with the instantaneous picture I took; there will really be nothing of you on that plate that you would recognise as yourself. That was why I refused to destroy it.”

“I am afraid,” said Miss Sommerton, sadly, “you are trying to make my punishment harder and harder. I believe in reality you are very cruel. You know how badly I feel about the whole matter, and now even the one little point that apparently gave me any excuse is taken away by your scientific explanation.”

“Candidly, Miss Sommerton, I am more of a culprit than you imagine, and I suppose it is the tortures of a guilty conscience that caused me to make this explanation. I shall now confess without reserve. As you sat there with your head in your hand looking at the falls, I deliberately and with malice aforethought took a timed picture, which, if developed, will reveal you exactly as you sat, and which will not show the falls at all.”

Miss Sommerton walked in silence beside him, and he could not tell just how angry she might be. Finally he said, “I shall destroy that plate, if you order me to.”

Miss Sommerton made no reply, until they were nearly at the canoe. Then she looked up at him with a smile, and said, “I think it a pity to destroy any pictures you have had such trouble to obtain.”