"I have no such intention. In one moment I will explain my purpose to you. Meanwhile watch me!"
With dexterous skill he plunged the point into one of the larger veins, and discharged the fluid carefully, holding a finger over the wound as he withdrew the needle to prevent any escape. If Mr. Barnes was astonished by this, he was more surprised at what followed. The Doctor stooped and picked up the ends of the chain, which the detective now observed terminated in handcuffs. These the Doctor slipped over his wrists, and snapping together the spring locks, thus virtually imprisoned himself.
"What does this mean?" said Mr. Barnes. "I do not understand."
"Of course not," said the Doctor. "You are accustomed to deal with brainless criminals. Despite your boast, science is beyond you. I will explain: My object in thus chaining myself to the floor, is to insure your safety."
"My safety?"
"Yes! In less than half an hour I will be a raving maniac. If not restrained, I might do you an injury."
"Impossible!" cried the detective, incredulous.
"You will see! I ask in exchange for my thoughtfulness in preventing myself from harming you, that when I shall have become irresponsible, you will suggest the idea that I felt this attack of insanity coming on, and took these precautions for the sake of others. Will you do this?"
"Certainly! If——" Mr. Barnes stopped, confused by his thoughts.
"There is no if about this. I do not deal in chances. I have never yet made an error, and you will see that my prediction will be fulfilled. But time, precious time, is passing, and I have much to say before I lose my reason. You have heard of hydrophobia, have you not? And of Pasteur's experiments?"