"I doubt if I understand you."

"Things that cannot be explained so widen the horizon around us! open to us fresh regions for question and answer, for possibility and delight! They are so many kernels of knowledge closed in the hard nuts of seeming contradiction.--You know, my lady, there are stories of certain houses being haunted by a mysterious music presaging evil to the family?"

"I have heard of such music. But what can be the use of it?"

"I do not know. I see not the smallest use in it. If it were of use it would surely be more common! If it were of use, why should those who have it be of the cla.s.s less favoured, so to speak, of the Lord of the universe, and the families of his poor never have it?"

"Perhaps for the same reason that they have their other good things in this life!" said Arctura.

"I am answered," confessed Donal, "and have no more to say. These tales, if they require of us a belief in any special care over such houses, as if they were more precious in the eyes of G.o.d than the poorest cottage in the land, I cast them from me."

"But," said Arctura, in a deprecating tone, "are not those houses which have more influence more important than the others?"

"Surely--those which have more good influence. But such are rarely the great houses of a country. Our Lord was not an Asmonaean prince, but the son of a humble maiden, his reputed father a working man."

"I do not see--I should like to understand how that has to do with it."

"You may be sure the Lord took the position in life in which it was most possible to do the highest good; and without driving the argument--for every work has its own specialty--it seems probable that the true ends of his coming will still be better furthered from the standpoint of humble circ.u.mstances, than from that of rank and position."

"You always speak," said Arctura, "as if there were only the things Jesus Christ came for to be cared about:--is there nothing but salvation worthy a human being's regard?"

"If you give a true and large enough meaning to the word salvation, I answer you at once, Nothing. Only in proportion as a man is saved, will he do the work of the world aright--the whole design of which is to rear a beautiful blessed family. The world is G.o.d's nursery for his upper rooms. Oneness with G.o.d is the end of the order of things. When that is attained, we shall do greater things than the Lord himself did on the earth!--But was not that aeolus?--Listen!"

There came a low prolonged wail.

The ladder was in readiness; Donal set it up in haste, climbed to the cleft, and with a sheet of brown paper in his hands, waited the next cry of the prisoned chords. He was beginning to get tired of his position, when suddenly came a stronger puff, and he heard the music distinctly in the shaft beside him. It swelled and grew. He spread the sheet of paper over the opening, the wind blew it flat against the chimney, and the sound instantly ceased. He removed it, and again came the sound. The wind continued, and grew stronger, so that they were able to make the simple experiment until no shadow of a doubt was left: they had discovered the source of the music! By certain dispositions of the paper they were even able to modify it.

Donal descended, and said to Davie,

"I wish you not to say a word about this to any one, Davie, before lady Arctura or I give you leave. You have a secret with us now. The castle belongs to lady Arctura, and she has a right to ask you not to speak of it to any one without her permission.--I have a reason, my lady," he went on, turning to Arctura: "will you, please, desire Davie to attend to what I say. I will immediately explain to you, but I do not want Davie to know my reason until you do. You can on the instant withdraw your prohibition, should you not think my reason a good one."

"Davie," said Arctura, "I too have faith in Mr. Grant: I beg you will keep all this a secret for the present."

"Oh surely, cousin Arkie!" said Davie. "--But, Mr. Grant, why should you make Arkie speak to me too?"

"Because the thing is her business, not mine. Run down and wait for me in my room. Go steadily over the bartizan, mind."

Donal turned again to Arctura.

"You know they say there is a hidden room in the castle, my lady?"

"Do you believe it?" she returned.

"I think there may be such a place."

"Surely if there had been, it would have been found long ago."

"They might have said that on the first report of the discovery of America!"

"That was far off, and across a great ocean!"

"And here are thick walls, and hearts careless an timid!--Has any one ever set in earnest about finding it?"

"Not that I know of."

"Then your objection falls to the ground. If you could have told me that one had tried to find the place, but without success, I would have admitted some force in it, though it would not have satisfied me without knowing the plans he had taken, and how they were carried out.

On the other hand it may have been known to many who held their peace about it.--Would you not like to know the truth concerning that too?"

"I should indeed. But would not you be sorry to lose another mystery?"

"On the contrary, there is only the rumour of a mystery now, and we do not quite believe it. We are not at liberty, in the name of good sense, to believe it yet. But if we find the room, or the s.p.a.ce even where it may be, we shall probably find also a mystery--something never in this world to be accounted for, but suggesting a hundred unsatisfactory explanations. But, pardon me, I do not in the least presume to press it."

Lady Arctura smiled.

"You may do what you please," she said. "If I seemed for a moment to hesitate, it was only that I wondered what my uncle would say to it. I should not like to vex him."

"Certainly not; but would he not be pleased?"

"I will speak to him, and find out. He hates what he calls superst.i.tion, and I fancy has curiosity enough not to object to a search. I do not think he would consent to pulling down, but short of that, I don't think he will mind. I should not wonder if he even joined in the search."

Donal thought with himself it was strange then he had never undertaken one. Something told him the earl would not like the proposal.

"But tell me, Mr. Grant--how would you set about it?" said Arctura, as they went towards the tower.

"If the question were merely whether or not there was such a room, and not the finding of it,--"

"Excuse me--but how could you tell whether there was or was not such a room except by searching for it?"

"By determining whether there was or was not some s.p.a.ce in the castle unaccounted for."

"I do not see."

"Would you mind coming to my room? It will be a lesson for Davie too!"

She a.s.sented, and Donal gave them a lesson in cubic measure and content. He showed them how to reckon the s.p.a.ce that must lie within given boundaries: if then within those boundaries they could not find so much, part of it must be hidden. If they measured the walls of the castle, allowing of course for their thickness and every irregularity, and from that calculated the s.p.a.ce they must hold; then measured all the rooms and open places within the walls, allowing for all part.i.tions; and having again calculated, found the s.p.a.ce fall short of what they had from the outside measurements to expect; they must conclude either that they had measured or calculated wrong, or that there was s.p.a.ce in the castle to which they had no access.

"But," continued Donal, when they had in a degree mastered the idea, "if the thing was, to discover the room itself, I should set about it in a different way; I should not care about the measuring. I would begin and go all over the castle, first getting the outside shape right in my head, and then fitting everything inside it into that shape of it in my brain. If I came to a part I could not so fit at once, I would examine that according to the rules I have given you, take exact measurements of the angles and sides of the different rooms and pa.s.sages, and find whether these enclosed more s.p.a.ce than I could at once discover inside them.--But I need not follow the process farther: pulling down might be the next thing, and we must not talk of that!"

"But the thing is worth doing, is it not, even if we do not go so far as to pull down?"

"I think so."

"And I think my uncle will not object.--Say nothing about it though, Davie, till we give you leave."

That we was pleasant in Donal's ears.

Lady Arctura rose, and they all went down together. When they reached the hall, Davie ran to get his kite.

"But you have not told me why you would not have him speak of the music," said Arctura, stopping at the foot of the great stair.