in daylight, in Mrs. Cazenove’s room, could not have been used to light the table-top, in the full glare of the window; therefore it had been used for some other purpose—­what purpose I could not, at the moment, guess.  Habitual thieves, you know, often have curious superstitions, and some will never take anything without leaving something behind—­a pebble or a piece of coal, or something like that—­in the premises they have been robbing.  It seemed at first extremely likely that this was a case of that kind.  The match had clearly been brought in—­because, when I asked for matches, there were none in the stand, not even an empty box, and the room had not been disturbed.  Also the match probably had not been struck there, nothing having been heard, although, of course, a mistake in this matter was just possible.  This match, then, it was fair to assume, had been lit somewhere else and blown out immediately—­I remarked at the time that it was very little burned.  Plainly it could not have been treated thus for nothing, and the only possible object would have been to prevent it igniting accidentally.  Following on this, it became obvious that the match was used, for whatever purpose, not as a match, but merely as a convenient splinter of wood.

“So far so good.  But on examining the match very closely I observed, as you can see for yourself, certain rather sharp indentations in the wood.  They are very small, you see, and scarcely visible, except upon narrow inspection; but there they are, and their positions are regular.  See, there are two on each side, each opposite the corresponding mark of the other pair.  The match, in fact, would seem to have been gripped in some fairly sharp instrument, holding it at two points above and two below—­an instrument, as it may at once strike you, not unlike the beak of a bird.

“Now here was an idea.  What living creature but a bird could possibly have entered Mrs. Heath’s window without a ladder—­supposing no ladder to have been used—­or could have got into Mrs. Armitage’s window without lifting the sash higher than the eight or ten inches it was already open?  Plainly, nothing.  Further, it is significant that only one article was stolen at a time, although others were about.  A human being could have carried any reasonable number, but a bird could only take one at a time.  But why should a bird carry a match in its beak?  Certainly it must have been trained to do that for a purpose, and a little consideration made that purpose pretty clear.  A noisy, chattering bird would probably betray itself at once.  Therefore it must be trained to keep quiet both while going for and coming away with its plunder.  What readier or more probably effectual way than, while teaching it to carry without dropping, to teach it also to keep quiet while carrying?  The one thing would practically cover the other.