“Come with me, Vad Varo,” he directed. “We will have a look at the two cases in L-42-X, the two of which I spoke.”

“The man with half a simian brain and the ape with a half human brain?” I asked.

He nodded and preceded me towards the runway that led to the vaults beneath the building. As we descended, the corridors and passageways indicated long disuse. The floors were covered with an impalpable dust, long undisturbed; the tiny radium bulbs that faintly illuminated the sub-barsoomian depths were likewise coated. As we proceeded, we passed many doorways on either side, each marked with its descriptive hieroglyphic. Several of the openings had been tightly sealed with masonry. What gruesome secrets were hid within? At last we came to L-42-X. Here the bodies were arranged on shelves, several rows of which almost completely filled the room from floor to ceiling, except for a rectangular space in the centre of the chamber, which accommodated an ersite topped operating table with its array of surgical instruments, its motor and other laboratory equipment.

Ras Thavas searched out the subjects of his strange experiment and together we carried the human body to the table. While Ras Thavas attached the tubes I returned for the vessel of blood which reposed upon the same shelf with the corpse. The now familiar method of revivification was soon accomplished and presently we were watching the return of consciousness to the subject.

The man sat up and looked at us, then he cast a quick glance about the chamber; there was a savage light in his eyes as they returned to us. Slowly he backed from the table to the floor, keeping the former between us.

“We will not harm you,” said Ras Thavas.

The man attempted to reply, but his words were unintelligible gibberish, then he shook his head and growled. Ras Thavas took a step towards him and the man dropped to all fours, his knuckles resting on the floor, and backed away, growling.

“Come!” cried Ras Thavas. “We will not harm you.” Again he attempted to approach the subject, but the man only backed quickly away, growling more fiercely; and then suddenly he wheeled and climbed quickly to the top of the highest shelf, where he squatted upon a corpse and gibbered at us.

“We shall have to have help,” said Ras Thavas and, going to the doorway, he blew a signal upon his whistle.

“What are you blowing that for?” demanded the man suddenly. “Who are you? What am I doing here? What has happened to me?”