"What, in Heaven's name, do you mean?" exclaimed Stopford, starting up.
"I mean that we can now prove when and where and how Miss Grant met her death. Come and sit down here, and I will explain. No, you needn't go away, Mr. Felton. We shall have to subpoena you. Perhaps," he continued, "we had better go over the facts and see what they suggest. And first we note the position of the body, lying with the feet close to the off-side door, showing that, when she fell, the deceased was sitting, or more probably standing, close to that door. Next there is this." He drew from his pocket a folded paper, which he opened, displaying a tiny blue disc. "It is one of the sequins with which her hat was trimmed, and I have in this envelope several more which I took from the hat itself.
"This single sequin I picked up on the rear end of the off side footboard, and its presence there makes it nearly certain that at some time Miss Grant had put her head out of the window on that side.
"The next item of evidence I obtained by dusting the margins of the off-side window with a light powder, which made visible a greasy impression three and a quarter inches long on the sharp corner of the right-hand jamb (right-hand from the inside, I mean).
"And now as to the evidence furnished by the body. The wound in the skull is behind and above the left ear, is roughly circular, and measures one inch and seven-sixteenths at most, and a ragged scalp-wound runs from it towards the left eye. On the right cheek is a linear contused wound three and a quarter inches long. There are no other injuries.
"Our next facts are furnished by this." He took up the horn and tapped it with his finger, while the solicitor and Mr. Felton stared at him in speechless wonder. "You notice it is a left horn, and you remember that it was highly sensitive. If you put your ear to it while I strain it, you will hear the grating of a fracture in the bony core. Now look at the pointed end, and you will see several deep scratches running lengthwise, and where those scratches end the diameter of the horn is, as you see by this calliper-gauge, one inch and seven-sixteenths. Covering the scratches is a dry blood-stain, and at the extreme tip is a small mass of a dried substance which Dr. Jervis and I have examined with the microscope and are satisfied is brain tissue."
"Good God!" exclaimed Stopford eagerly. "Do you mean to say—"
"Let us finish with the facts, Mr. Stopford," Thorndyke interrupted. "Now, if you look closely at that blood-stain, you will see a short piece of hair stuck to the horn, and through this lens you can make out the root-bulb. It is a golden hair, you notice, but near the root it is black, and our calliper-gauge shows us that the black portion is fourteen sixty-fourths of an inch long. Now, in this envelope are some hairs that I removed from the dead woman's head. They also are golden hairs, black at the roots, and when I measure the black portion I find it to be fourteen sixty-fourths of an inch long. Then, finally, there is this."
He turned the horn over, and pointed to a small patch of dried blood. Embedded in it was a blue sequin.
Mr. Stopford and the butcher both gazed at the horn in silent amazement; then the former drew a deep breath and looked up at Thorndyke.