"When the pointer is opposite 0, the photograph is the same size as the object photographed; when it points to, say, x 4, the photograph will be four times the width and length of the object, while if it should point to, say, / 4, the photograph will be one-fourth the length of the object.

It is now, you see, pointing to x 8, so the photograph will be eight times the diameter of the original thumb-mark." By this time Polton had brought the camera to an accurate focus and, when we had all been gratified by a glimpse of the enlarged image on the focussing screen, we withdrew to a smaller room which was devoted to bacteriology and microscopical research, while the exposure was made and the plate developed.

Here, after an interval, we were joined by Polton, who bore with infinite tenderness the dripping negative on which could be seen the grotesque transparency of a colossal thumb-mark.
This Thorndyke scrutinised eagerly, and having pronounced it satisfactory, informed Mrs.Hornby that the object of her visit was attained, and thanked her for the trouble she had taken.
"I am very glad we came," said Miss Gibson to me, as a little later we walked slowly up Mitre Court in the wake of Mrs.Hornby and Thorndyke; "and I am glad to have seen these wonderful instruments, too.

It has made me realise that something is being done and that Dr.Thorndyke really has some object in view.

It has really encouraged me immensely." "And very properly so," I replied.