He began by drawing off a little of Rusty's
blood in a tube, very carefully.
"Here, Walter," he said pointing to the little incision he had
made. "Will you take care of him?"
I bound up the wounded leg and gave the poor beast a drink of
water. Rusty looked at me gratefully from his big sad brown eyes.
He seemed to appreciate our gentleness and to realize that we were
trying to help him.
In the meantime, Craig had taken a flask with a rubber stopper.
Through one hole in it was fitted a long funnel; through another
ran a glass tube. The tube connected with a large U-shaped drying
tube filled with calcium chloride, which, in turn, connected with
a long open tube with an upturned end.
Into the flask, Craig dropped some pure granulated zinc. Then he
covered it with dilute sulphuric acid, poured in through the
funnel tube.
"That forms hydrogen gas," he explained to me, "which passes
through the drying tube and the ignition tube. Wait a moment until
all the air is expelled from the tubes."
He lighted a match and touched it to the open, upturned end. The
hydrogen, now escaping freely, was ignited with a pale blue flame.
A few moments later, having extracted something like a serum from
the blood he had drawn off from Rusty. He added the extract to the
mixture in the flask, pouring it in, also through the funnel tube.
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