Each signature was eventually mounted on a slip of card bearing a number and the date of the cheque from which it was taken, so that it was possible to place any two signatures together for comparison.

I looked over the whole series and very carefully compared those which showed any differences, but without discovering anything more than might have been expected in view of Mr.Britton's statement.

There were some trifling variations, but they were all very much alike, and no one could doubt, on looking at them, that they were all written by the same hand.
As this, however, was apparently not in dispute, it furnished no new information.

Thorndyke's object--for I felt certain that he had something definite in his mind--must be to test something apart from the genuineness of the signatures.

But what could that something be?
I dared not ask him, for questions of that kind were anathema, so there was nothing for it but to lie low and see what he would do with the photographs.
The whole series was finished on the fourth morning after my adventure at Sloane Square, and the pack of cards was duly delivered by Polton when he brought in the breakfast tray.