“You will now light the gas, Watson, but you will be very careful that not for one instant shall it be more than half on. I implore you to be careful, Watson. Thank you, that is excellent. No, you need not draw the blind. Now you will have the kindness to place some letters and papers upon this table within my reach. Thank you. Now some of that litter from the mantelpiece. Excellent, Watson! There is a sugar-tongs there. Kindly raise that small ivory box with its assistance. Place it here among the papers. Good! You can now go and fetch Mr. Culverton Smith, of 13 Lower Burke Street.”

To tell the truth, my desire to fetch a doctor had somewhat weakened, for poor Holmes was so obviously delirious that it seemed dangerous to leave him. However, he was as eager now to consult the person named as he had been obstinate in refusing.

“I never heard the name,” said I.

“Possibly not, my good Watson. It may surprise you to know that the man upon earth who is best versed in this disease is not a medical man, but a planter. Mr. Culverton Smith is a well-known resident of Sumatra, now visiting London. An outbreak of the disease upon his plantation, which was distant from medical aid, caused him to study it himself, with some rather far-reaching consequences. He is a very methodical person, and I did not desire you to start before six, because I was well aware that you would not find him in his study. If you could persuade him to come here and give us the benefit of his unique experience of this disease, the investigation of which has been his dearest hobby, I cannot doubt that he could help me.”

I give Holmes’s remarks as a consecutive whole and will not attempt to indicate how they were interrupted by gaspings for breath and those clutchings of his hands which indicated the pain from which he was suffering. His appearance had changed for the worse during the few hours that I had been with him. Those hectic spots were more pronounced, the eyes shone more brightly out of darker hollows, and a cold sweat glimmered upon his brow. He still retained, however, the jaunty gallantry of his speech. To the last gasp he would always be the master.

“You will tell him exactly how you have left me,” said he. “You will convey the very impression which is in your own mind - a dying man - a dying and delirious man. Indeed, I cannot think why the whole bed of the ocean is not one solid mass of oysters, so prolific the creatures seem. Ah, I am wandering! Strange how the brain controls the brain! What was I saying, Watson?”

“My directions for Mr. Culverton Smith.”

“Ah, yes, I remember. My life depends upon it. Plead with him, Watson. There is no good feeling between us. His nephew, Watson - I had suspicions of foul play and I allowed him to see it. The boy died horribly. He has a grudge against me. You will soften him, Watson. Beg him, pray him, get him here by any means. He can save me - only he!”

“I will bring him in a cab, if I have to carry him down to it.”

“You will do nothing of the sort. You will persuade him to come. And then you will return in front of him. Make any excuse so as not to come with him. Don’t forget, Watson. You won’t fail me. You never did fail me. No doubt there are natural enemies which limit the increase of the creatures. You and I, Watson, we have done our part. Shall the world, then, be overrun by oysters? No, no; horrible! You’ll convey all that is in your mind.”

I left him full of the image of this magnificent intellect babbling like a foolish child. He had handed me the key, and with a happy thought I took it with me lest he should lock himself in. Mrs. Hudson was waiting, trembling and weeping, in the passage. Behind me as I passed from the flat I heard Holmes’s high, thin vo ice in some delirious chant. Below, as I stood whistling for a cab, a man came on me through the fog.