FOOTNOTES:
[6] When this was written gold coins were legal tender. Gold payments were outlawed by Congress in 1933.
8
THE MENACE OF THE INVISIBLE CLOAK
Leaving the Pennsylvania mills the aeroflyer, traveling at high speed landed the party within a very short time on one of the tall landing buildings in New York. Ralph and Alice made their way down to the elevated roadway, where, at Ralph's suggestion they put on their power skates, for, as he explained smilingly, it was but a short distance to his home and the exercise would do them both good and give them an appetite for luncheon.
When they were but a little way from their destination Ralph became conscious of a faint hissing sound close behind them. Twice he glanced over his shoulder, but the roadway at that hour—it was just before
