I need not warn you to be careful lest you give to any one the means of reaching them.

I have shown you the combination of magnets which will open each of your cases; that demanded by the chest is the most complicated of all, and one which can hardly be hit upon by accident.
Nor can any one force or pick open a case locked by our electric apparatus, save by cutting to pieces the metal of the case itself, and this only special tools will accomplish; and, unless peculiarly skilful, the intruder would 'probably be maimed or paralysed, if not killed by ...
"Thoughts he sends to each planet, Uranus, Venus, and Mars; Soars to the Centre to span it, Numbers the infinite Stars." _Courthope's Paradise of Birds_.