This point is so often forgotten by beginners, and yet it is one of
the most important.
I was at one time watched by a detective who one day was a
soldierly-looking fellow and the next an invalid with a patch over
his eye. I could not believe it was the same man until I watched him
from behind and saw him walking, when at once his individuality was
apparent.
For mannerisms, a spy has by practice to be able to show an impediment
in his speech one day, whereas the next a wiggle of an eyelid or a
snuffling at the nose will make him appear a totally different being.
For a quick change, it is wonderful what difference is made by merely
altering your hat and necktie. It is usual for a person addressing
another to take note of his necktie, and probably of his hat, if of
nothing else, and thus it is often useful to carry a necktie and a
cap of totally different hue from that which you are wearing, ready to
change immediately in order to escape recognition a few minutes later.
[Illustration: _This illustration shows how the writer was able to
disguise himself at very short notice when he observed that he was
recognised on a railway station. The first sketch shows him as he
entered a waiting-room shortly after his suspicions were aroused.
The second depicts him on his exit a few minutes later. The disguise,
simple though it may seem, was entirely successful.
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