'Sound, sir?'

'Yes, sir, sound.'

'My dear sir, I am not aware of any sound, except my great table, which I moved on rising to let you in.'

'The table!—let me see that. No, sir; not a tenth part heavy enough, not a tenth part.'

'But, sir, you do not consider the laws of acoustics: a whisper becomes a peal of thunder in the focus of reverberation. Allow me to explain this: sounds striking on concave surfaces are reflected from them, and, after reflection, converge to points which are the foci of these surfaces. It follows, therefore, that the ear may be so placed in one, as that it shall hear a sound better than when situated nearer to the point of the first impulse: again, in the case of two concave surfaces placed opposite to each other—'

'Nonsense, sir. Don't tell me of foci. Pray, sir, will concave surfaces produce two voices when nobody speaks? I heard two voices, and one was feminine; feminine, sir: what say you to that?'

'Oh, sir, I perceive your mistake: I am writing a tragedy, and was acting over a scene to myself. To convince you, I will give you a specimen; but you must first understand the plot. It is a tragedy on the German model. The Great Mogul is in exile, and has taken lodgings at Kensington, with his only daughter, the Princess Rantrorina, who takes in needlework, and keeps a day school. The princess is discovered hemming a set of shirts for the parson of the parish: they are to be marked with a large R. Enter to her the Great Mogul. A pause, during which they look at each other expressively. The princess changes colour several times. The Mogul takes snuff in great agitation. Several grains are heard to fall on the stage. His heart is seen to beat through his upper benjamin.—THE MOGUL (with a mournful look at his left shoe). 'My shoe-string is broken.'—THE PRINCESS (after an interval of melancholy reflection). 'I know it.' THE MOGUL. 'My second shoe-string! The first broke when I lost my empire: the second has broken to-day. When will my poor heart break?'—THE PRINCESS. 'Shoe-strings, hearts, and empires! Mysterious sympathy!'

'Nonsense, sir,' interrupted Mr Glowry. 'That is not at all like the voice I heard.'

'But, sir,' said Scythrop, 'a key-hole may be so constructed as to act like an acoustic tube, and an acoustic tube, sir, will modify sound in a very remarkable manner. Consider the construction of the ear, and the nature and causes of sound. The external part of the ear is a cartilaginous funnel.'

'It wo'n't do, Scythrop. There is a girl concealed in this tower, and find her I will. There are such things as sliding panels and secret closets.'—He sounded round the room with his cane, but detected no hollowness.—'I have heard, sir,' he continued, 'that during my absence, two years ago, you had a dumb carpenter closeted with you day after day. I did not dream that you were laying contrivances for carrying on secret intrigues. Young men will have their way: I had my way when I was a young man: but, sir, when your cousin Marionetta—'