But if you look at this photograph you will see that all the wedges point upwards to the left and that the arrow-head characters are open towards the left.

Obviously the photograph is upside down." "But," I exclaimed, "this is really most mysterious.

What do you suppose can be the explanation ?" "I think," replied Thorndyke, "that we may perhaps get a suggestion from the back of the frame.

Let us see." He disengaged the frame from the two nails on which it hung, and, turning it round, glanced at the back; which he then presented for my inspection.

A label on the backing paper bore the words, "J.