The little incident which I have alluded to as confirming Mary's belief was, that, at some period not very far from midnight, the watchman had specially noticed this stranger; he had observed him continually peeping into the window of Marr's shop; and had thought this act, connected with the man's appearance, so suspicious, that he stepped into Marr's shop, and communicated what he had seen. This fact he afterwards stated before the magistrates; and he added, that subsequently, viz., a few minutes after twelve (eight or ten minutes, probably, after the departure of Mary), he (the watchman), when re-entering upon his ordinary half-hourly beat, was requested by Marr to assist him in closing the shutters. Here they had a final communication with each other; and the watchman mentioned to Marr that the mysterious stranger had now apparently taken himself off; for that he had not been visible since the first communication made to Marr by the watchman. There is little doubt that Williams had observed the watchman's visit to Marr, and had thus had his attention seasonably drawn to the indiscretion of his own demeanor; so that the warning, given unavailingly to Marr, had been turned to account by Williams. There can be still less doubt, that the bloodhound had commenced his work within one minute of the watchman's assisting Marr to put up his shutters. And on the following consideration:--that which prevented Williams from commencing even earlier, was the exposure of the shop's whole interior to the gaze of street passengers. It was indispensable that the shutters should be accurately closed before Williams could safely get to work. But, as soon as ever this preliminary precaution had been completed, once having secured that concealment from the public eye it then became of still greater importance not to lose a moment by delay, than previously it had been not to hazard any thing by precipitance. For all depended upon going in before Marr should have locked the door. On any other mode of effecting an entrance (as, for instance, by waiting for the return of Mary, and making his entrance simultaneously with her), it will be seen that Williams must have forfeited that particular advantage which mute facts, when read into their true construction, will soon show the reader that he must have employed. Williams waited, of necessity, for the sound of the watchman's retreating steps; waited, perhaps, for thirty seconds; but when that danger was past, the next danger was, lest Marr should lock the door; one turn of the key, and the murderer would have been locked out. In, therefore, he bolted, and by a dexterous movement of his left hand, no doubt, turned the key, without letting Marr perceive this fatal stratagem. It is really wonderful and most interesting to pursue the successive steps of this monster, and to notice the absolute certainty with which the silent hieroglyphics of the case betray to us the whole process and