“Of course. The house is entirely at his disposal. One does not care to have a death-trap in one’s own house.”

“He will do his best—of that I feel quite sure,” I said.

And then again promising to visit her soon, I shook her hand, bade them both adieu, and with a last look at the frail, graceful woman I loved, went out into the hot, dusty street.

In order to celebrate my sudden accession to wealth I lunched well at Simpson’s, and then took a hansom to old Hoefer’s dismal rooms in. Bloomsbury. To me, so gloomy and severe is that once-aristocratic district that, in my hospital days, I called it Gloomsbury.

Hoefer occupied a dingy flat in Museum Mansions, and, as I entered the small room which served him as laboratory, I was almost knocked back by the choking fumes of some acid with which he was experimenting. A dense blue smoke hung over everything, and through it loomed the German’s great fleshy face and gold-rimmed spectacles. He was in his shirt-sleeves, seated at a table, watching some liquid boiling in a big glass retort. Around his mouth and nose a damp towel was tied, and as I entered he motioned me back.

“Ach! don’t come in here, my tear Colkirk! I vill come to you. Ze air is not good just now. Wait for me there in my room.”

Heedless of his warning, however, I went forward to the table, coughing and choking the while. I took out my handkerchief, when suddenly he snatched it from me, and steeped it in some pale yellow solution. Then, when I placed it before my mouth, inhaling it, I experienced no further difficulty in respiration.

The nature of the experiment on which he was engaged I could not determine. From the retort he was condensing those suffocating fumes, drop by drop, now and then dipping pieces of white, prepared paper into the liquid thus obtained. I stood by watching in silence.

Once he placed a drop of that liquid upon a glass slide, dried it for crystallisation, and, placing it beneath the microscope, examined it carefully.

He grunted. And I knew he was not satisfied.