In the old days of weak
engines, when a hundred horse-power Gnome or Green was considered
ample for every need, the flights were very restricted. Now that
three hundred horse-power is the rule rather than the exception,
visits to the upper layers have become easier and more common.
Some of us can remember how, in our youth, Garros made a world-wide
reputation by attaining nineteen thousand feet, and it was
considered a remarkable achievement to fly over the Alps. Our
standard now has been immeasurably raised, and there are twenty
high flights for one in former years. Many of them have been
undertaken with impunity. The thirty-thousand-foot level has been
reached time after time with no discomfort beyond cold and asthma.
What does this prove? A visitor might descend upon this planet a
thousand times and never see a tiger. Yet tigers exist, and if he
chanced to come down into a jungle he might be devoured. There are
jungles of the upper air, and there are worse things than tigers
which inhabit them. I believe in time they will map these jungles
accurately out. Even at the present moment I could name two of
them. One of them lies over the Pau-Biarritz district of France.
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