“I am glad to say that my investigation has not been entirely barren,” he remarked. “I cannot remain to discuss the matter with the police, but I should be exceedingly obliged, Mr. Roundhay, if you would give the inspector my compliments and direct his attention to the bedroom window and to the sitting-room lamp. Each is suggestive, and together they are almost conclusive. If the police would desire further information I shall be happy to see any of them at the cottage. And now, Watson, I think that, perhaps, we shall be better employed elsewhere.”

It may be that the police resented the intrusion of an amateur, or that they imagined themselves to be upon some hopeful line of investigation; but it is certain that we heard nothing from them for the next two days. During this time Holmes spent some of his time smoking and dreaming in the cottage; but a greater portion in country walks which he undertook alone, returning after many hours without remark as to where he had been. One experiment served to show me the line of his investigation. He had bought a lamp which was the duplicate of the one which had burned in the room of Mortimer Tregennis on the morning of the tragedy. This he filled with the same oil as that used at the vicarage, and he carefully timed the period which it would take to be exhausted. Another experiment which he he made was of a more unpleasant nature, and one which I am not likely ever to forget.

“You will remember, Watson,” he remarked one afternoon, “that there is a single common point of resemblance in the varying reports which have reached us. This concerns the effect of the atmosphere of the room in each case upon those who had first entered it. You will recollect that Mortimer Tregennis, in describing the episode of his last visit to his brother’s house, remarked that the doctor on entering the room fell into a chair? You had forgotten? Well, I can answer for it that it was so. Now, you will remember also that Mrs. Porter, the housekeeper, told us that she herself fainted upon entering the room and had afterwards opened the window. In the second case — that of Mortimer Tregennis himself — you cannot have forgotten the horrible stuffiness of the room when we arrived. though the servant had thrown open the window. That servant, I found upon inquiry, was so ill that she had gone to her bed. You will admit, Watson, that these facts are very suggestive. In each case there is evidence of a poisonous atmosphere. In each case, also, there is combustion going on in the room — in the one case a fire, in the other a lamp. The fire was needed, but the lamp was lit — as a comparison of the oil consumed will show — long after it was broad daylight. Why? Surely because there is some connection between three things — the burning, the stuffy atmosphere, and, finally, the madness or death of those unfortunate people. That is clear, is it not?”

“It would appear so.”

“At least we may accept it as a working hypothesis. We will suppose, then, that something was burned in each case which produced an atmosphere causing strange toxic effects. Very good. In the first instance — that of the Tregennis family — this substance was placed in the fire. Now the window was shut, but the fire would naturally carry fumes to some extent up the chimney. Hence one would expect the effects of the poison to be less than in the second case, where there was less escape for the vapour. The result seems to indicate that it was so, since in the first case only the woman, who had presumably the more sensitive organism, was killed, the others exhibiting that temporary or permanent lunacy which is evidently the first effect of the drug. In the second case the result was complete. The facts, therefore, seem to bear out the theory of a poison which worked by combustion.

‘I hated it. And she hated me. My God, how she hated me before that child was born! I often think she conceived it out of hate. Anyhow, after the child was born I left her alone. And then came the war, and I joined up. And I didn’t come back till I knew she was with that fellow at Stacks Gate.

He broke off, pale in the face.

‘And what is the man at Stacks Gate like?’ asked Connie.

‘A big baby sort of fellow, very low–mouthed. She bullies him, and they both drink.’

‘My word, if she came back!’

‘My God, yes! I should just go, disappear again.’

There was a silence. The pasteboard in the fire had turned to grey ash.

‘So when you did get a woman who wanted you,’ said Connie, ‘you got a bit too much of a good thing.’

‘Ay! Seems so! Yet even then I’d rather have her than the never–never ones: the white love of my youth, and that other poison–smelling lily, and the rest.’

‘What about the rest?’ said Connie.

‘The rest? There is no rest. Only to my experience the mass of women are like this: most of them want a man, but don’t want the sex, but they put up with it, as part of the bargain. The more old–fashioned sort just lie there like nothing and let you go ahead. They don’t mind afterwards: then they like you. But the actual thing itself is nothing to them, a bit distasteful. Add most men like it that way. I hate it. But the sly sort of women who are like that pretend they’re not. They pretend they’re passionate and have thrills. But it’s all cockaloopy. They make it up. Then there’s the ones that love everything, every kind of feeling and cuddling and going off, every kind except the natural one. They always make you go off when you’re NOTin the only place you should be, when you go off.—Then there’s the hard sort, that are the devil to bring off at all, and bring themselves off, like my wife. They want to be the active party.—Then there’s the sort that’s just dead inside: but dead: and they know it. Then there’s the sort that puts you out before you really ‘‘come’’, and go on writhing their loins till they bring themselves off against your thighs. But they’re mostly the Lesbian sort. It’s astonishing how Lesbian women are, consciously or unconsciously. Seems to me they’re nearly all Lesbian.’

‘And do you mind?’ asked Connie.

‘I could kill them. When I’m with a woman who’s really Lesbian, I fairly howl in my soul, wanting to kill her.’

‘And what do you do?’

‘Just go away as fast as I can.’

‘But do you think Lesbian women any worse than homosexual men?’

‘ I do! Because I’ve suffered more from them. In the abstract, I’ve no idea. When I get with a Lesbian woman, whether she knows she’s one or not, I see red. No, no! But I wanted to have nothing to do with any woman any more. I wanted to keep to myself: keep my privacy and my decency.’