At one point in the map Long Sin's bony finger paused over a note which
Bennett had made:
BEWARE POISONED GAS UPON OPENING COMPARTMENT.
"And you think you can trace it out?" asked Wu.
"Without a doubt," bowed Long Sin.
He went over to a bag near-by, which he had already sent up by another servant, and opened it. Inside was an oxygen helmet. He replaced it, after showing it to Wu.
"With the aid of the science of the white devil, we shall overcome the science of the white devil," purred Long Sin subtly.
Outside, Wu had already ordered a car to wait, and together the two drove off rapidly. Into the country, they sped, until at last they came to a lonely turn in a lonely road, somewhat removed from the section that was rapidly being built up as population reached out from the city, but on a single-tracked trolley line.
Long Sin alighted and disappeared with a parting word of instruction from Wu who remained in the car. The Chinaman carried with him the heavy bag with the oxygen helmet.
Along this interurban trolley the cars made only half-hourly trips at this time of night. Long Sin hurried down the road until he came to a trolley pole, then looked hastily at his watch. It was twenty minutes at least before the next car would pass.
Quickly, almost monkey-like, he climbed up the pole, carrying with him the end of a wire which he had taken from the bag.