Ian lifted his bowed head and addressed Tims:

"I should like to know exactly what your view of the matter is, Miss Timson. We need not discuss poor Milly's; it's too absurd and also too painful."

"It's no doubt a case of disintegration of personality," replied Tims, after a pause. "Somewhere inside our brains must be a nerve-centre which co-ordinates most of our mental, our sensory and motor processes, in such a manner as to produce consciousness, volition, what we call personality. But after all there are always plenty of activities within us going on independent of it. Your heart beats, your stomach digests—even your memory works apart from your consciousness sometimes. Now suppose some shock or strain enfeebles your centre of consciousness, so that it ceases to be able to co-ordinate all the mental processes it has been accustomed to superintend. What you call your personality is the outcome of your memory and all your other faculties and tendencies working together, checking and balancing each other. Suppose your centre of consciousness so enfeebled; suppose at the same time an enfeeblement of memory, causing you to completely forget external facts: certain of your faculties and tendencies are left working and they are co-ordinated without an important part of the memory, without many other faculties and tendencies which checked and balanced them. Naturally you appear to yourself and to every one else a totally different person; but it's not a new personality really, it's only a bit of the old one which goes on its own hook, while the rest is quiescent."

"This is the most abominably materialistic theory of the human mind I ever heard," exclaimed Lady Thomson, indignantly. "The most degrading to our spiritual natures."

Ian leaned against the high, carved mantel-piece and pushed back the black hair from his forehead.

"I'm not concerned with that," he replied, deliberately, discussing this case so vitally near to him with an almost terrible calmness. "But I can't feel that this disintegration theory altogether covers the ground. There is no development of characteristics previously to be found in Milly; on the contrary, the qualities of mind and character which she exhibits when—when the change comes over her, are precisely the opposite of those she exhibits in what I presume we ought to call her normal state."

"There must be some reason for it, old chap, you know," returned Tims; "and it seems to me that's the line you've got to move along, unless you're an idiot and go in for devils or spiritualistic nonsense."

"I believe I've followed what you've been saying, Miss Timson," said Lady Thomson, in her fullest tones; "and I can assure you I feel under no necessity to become either a materialist or an idiot in consequence."

Ian spoke again.

"I don't profess to be scientific, but I do seem to see another possible line, running parallel with yours, but not quite the same. It's evident we can inherit faculties, characteristics, from our ancestors which never become active in us; but we know they must have been present in us in a quiescent state, because we can transmit them to children in whom they become active. Mildred's father and mother, for example, are not scholars, although her grandfather and great-grandfather were; yet in one of her parents at least there must be a germ of the scholar's faculty which has never been developed, because Mildred has inherited it. Now why can't we develop all the faculties, the germs of which lie within our borders? Perhaps because we have each only a certain amount of what I'll call vital current. If the Nile could overflow the whole desert it would all be fertilized, and perhaps if we had sufficient vital force we could develop all the faculties whose germs we inherit. Suppose by some accident, owing to a shock or strain, as you say, the flow of this vital current of ours is stopped in the direction in which it usually flows most strongly; its course is diverted and it fertilizes tracts of our brain and nervous system which before have been lying quiescent, sterile. If we lose the memory of our former lives, and if at the same time hereditary faculties and tendencies, of the existence of which we were unaware, suddenly become active in us, we are practically new personalities. Then say the vital current resumes its old course; we regain our memories, our old faculties, while the newly developed ones sink again into quiescence. We are once more our old selves. No doubt this is all very unscientific, but so far Science seems to have nothing to say on the question."