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his impending doom. If so, it came too late. Into his eyes came the look of a hunted animal as he saw the jar of deadly acid poised directly over his head. The bottle came hurtling downward as he started to rise and struck him full in the face, smashing to bits, while the acid gushed over his body. He fell to the floor writhing and shrieking in his death agony. The vengeance of Jean Perrin was accomplished.
Meanwhile the acid vigorously attacked the woodwork and glassware and flames soon sprang up from the heat of the reaction. A bottle of sodium exploded and row after row of bottles came crashing down, their chemical contents adding fuel and impetus to the flames.
Eldridge's escape via the corridor had been cut off from the first, and the scene held him fascinated. He made no attempt to leave through the doctor's office as he might have done at first. His present position had become one of great danger, owing to the explosive nature of some of the chemicals which had not yet been touched by the flames. The laboratory was rapidly becoming a raging inferno. High above all stood the jar and its contents, which had brought this thing to pass. The red eyes of the brain glittered triumphantly through the smoke and flames. Jaeger had become motionless. Then suddenly the shelf gave way and brain and jar crashed into the fire and disappeared. Long tongues of flame shot up to the very ceiling. Then came a bursting roar; a flying bottle struck Eldridge on the temple and oblivion descended.
WHEN Eldridge returned to consciousness, he found himself swathed in bandages on board a hospital ship bound for New York. His wife was with him, also his friend and co-worker, Felton, of the secret service, who, with a detachment sent from the American Army of Occupation,
