arry out the doctor's orders, and an
orderly appeared in a few moments with a hollow globe made of some
crystalline transparent substance. Despite its presence in the
infirmary the evening before, there was no trace of clouding apparent.
Dr. Bird took it and examined it critically. He rapped it with his
knuckles and then stepped to the door and hurled it violently down on
the concrete floor of the yard. The globe rebounded without injury and
he caught it.

"Vitrilene, or a good imitation of it," he remarked to Carnes. "After
you get through talking to the hospital, get Taylor on the wire. There
is plenty of loose vitrilene in the Bureau, and I want him to send
down about fifty square feet of it by a special plane at once."

As Carnes left the room, the warden reappeared.

"The men are all lying in the sun now, Doctor," he said. "I find that
we have the two men you mentioned confined here. They are both in Tier
A, Building 6."

"Is that an isolated building?"

"No, it is one wing of the old main building."

"On which floor?"

"The second floor. It is a six-story building."

"Have they been moved there recently?"

"They have been there for nearly a year."

* * * * *

"In that case there will be little chance of another attack of this
sort to-night. At the same time, I would advise you to station extra
guards there to-night and every night until I notify you otherwise.
Caution them to watch the lights carefully and to give an alarm at
once if they appear to get dim. In such a case, send men to the roof
with rifles with orders to shoot to kill anyone they find there. I am
going back to Washington and I am going to take Karuska, your No. 9764
with me. You had better have one of the guards in the corridor, where
Denberg and Semensky are, wear this goldfish bowl, as you call it. A
lot of plate glass--at least it will look like that--will come from
Washington by plane. Cut it into sheets a foot square and use
surgeon's plaster to make some temporary glass helmets for your men. I
want all your guards to wear them until I either settle this matter or
else send you some better helmets. Do you understand?"

"I understand all right, but I'm afraid that I can't do it. The
wearing of such appliances would interfere with the efficiency of my
men as guards."

"Brain and tongue paralysis would interfere rather more seriously, it
seems to me. In any event, I have sufficient authority to enfo