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AN HOUR OR TWO ON A ROOF

and Hugh bowed his thanks to the unseen operator below. Then he leant forward cautiously, and peered in.…

The whole room was visible to him, and his jaw tightened as he took in the scene. In an armchair, smoking as unconcernedly as ever, sat Peterson. He was reading a letter, and occasionally underlining some point with a pencil. Beside him on a table was a big ledger, and every now and then he would turn over a few pages and make an entry. But it was not Peterson on whom the watcher above was concentrating his attention; it was Lakington—and the thing beside him on the sofa.

Lakington was bending over a long bath full of some light-brown liquid from which a faint vapour was rising. He was in his shirt sleeves, and on his hands he wore what looked like rubber gloves, stretching right up to his elbows. After a while he dipped a test-tube into the liquid, and going over to a shelf he selected a bottle and added a few drops to the contents of the tube. Apparently satisfied with the result, he returned to the bath and shook in some white powder. Immediately the liquid commenced to froth and bubble, and at the same moment Peterson stood up.

"Are you ready?" he said, taking off his coat and picking up a pair of gloves similar to those the other was wearing.

"Quite," answered Lakington abruptly. "We'll get him in."

They approached the sofa; and Hugh, with a kind of fascinated horror, forced himself to look. For the