I was now sure that the bright flush upon her cheeks was due to what we doctors call pyrexia, the initial fever of smallpox, and that the pest which I had dreaded and fled from all my life was established in my home. The night was hot and I had drunk my fill of wine, but I sat and shook in the ague of my fear. Jane had the disease, but she was young and strong and might survive it. I should take it from her, and in that event assuredly must die, for the mind is master of the body and the thing we dread is the thing that kills us.

Probably, indeed, I had taken it already, and this very moment the seeds of sickness were at their wizard work within me. Well, even if it was so?—I gasped when the thought struck me—as Merchison had recognised in the case of Jane, by immediate vaccination the virus could be destroyed, or if not destroyed at least so much modified and weakened as to become almost harmless. Smallpox takes thirteen or fourteen days to develop; cowpox runs its course in eight. So even supposing that I had been infected for two days there was still time. Yes, but none to lose!

Well, the thing was easy—I was a doctor and I had a supply of glycerinated lymph; I had procured some fresh tubes of it only the other day, to hold it up before my audiences while I dilated on its foulness and explained the evils which resulted from its use. Supposing now that I made a few scratches on my arm and rubbed some of this stuff into them, who would be the wiser? The inflammation which would follow would not be sufficient to incapacitate me, and nobody can see through a man’s coat sleeve; even if the limb should become swollen or helpless I could pretend that I had strained it. Whatever I had preached to prove my point and forward my ambition, in truth I had never doubted the efficacy of vaccination, although I was well aware of the dangers that might result from the use of impure or contaminated lymph, foul surroundings, and occasionally, perhaps, certain conditions of health in the subject himself. Therefore I had no prejudice to overcome, and certainly I was not a Conscientious Objector.

It came to this then. There were only two reasons why I should not immediately vaccinate myself—first, that I might enjoy in secret a virtuous sense of consistency, which, in the case of a person who had proved himself so remarkably inconsistent in this very matter, would be a mere indulgence of foolish pride; and secondly, because if I did I might be found out. This indeed would be a catastrophe too terrible to think of, but it was not in fact a risk that need be taken into account.

But where was the use of weighing all these pros and cons? Such foolish doubts and idle arguments melted into nothingness before the presence of the spectre that stood upon my threshold, the hideous, spotted Pestilence who had slain my father, who held my daughter by the throat, and who threatened to grip me with his frightful fingers. What were inconsistencies and risks to me compared to my living terror of the Thing that had dominated my whole existence, reappearing at its every crisis, and by some strange fate even when it was far from me, throwing its spell over my mind and fortunes till, because of it, I turned my skill and knowledge to the propagation of a lie, so mischievous in its results that had the world known me as I was it would have done wisely to deal by me as it deals with a dangerous lunatic?

I would do it and at once.

First, although it was unnecessary as all the servants had gone to rest, I locked that door of my study which opened into the hall. The other door I did not think of locking, for beyond it was nothing but the private staircase which led to the wing of the house occupied by Jane and myself. Then I took off my coat and rolled up my shirt sleeve, fastening it with a safety-pin to the linen upon my shoulder. After this I lit a spirit-lamp and sterilised my lancet by heating it in the flame. Now, having provided myself with an ivory point and unsealed the tiny tube of lymph, I sat down in a chair so that the light from the electric lamp fell full upon my arm, and proceeded to scape the skin with the lancet until blood appeared in four or five separate places. Next I took the ivory point, and, after cleansing it, I charged it with the lymph and applied it to the abrasions, being careful to give each of them a liberal dose. The operation finished, I sat still awhile letting my arm hang over the back of the chair, in order that the blood might dry thoroughly before I drew down my shirt sleeve.

It was while I was sitting thus that I heard some movement behind me, and turned round suddenly to find myself face to face with my daughter Jane. She was clothed only in her nightdress and a bedroom wrapper, and stood near to the open staircase door, resting her hand upon the end of a lounge as though to support herself.

For one moment only I saw her and noted the look of horror in her eyes, the next I had touched the switch of the electric light, and, save for the faint blue glimmer of the spirit lamp, there was darkness.

“Father,” she said, and in the gloom her voice sounded far away and hollow, “what are you doing to your arm?”