R. Austin Freeman, The Eye of Osiris — I. The Vanishing Man (1911)
“ But the question as to which house he visited first hinges on the scarab. If he was wearing the scarab when he arrived at Mr. Hurst's house, it would be certain that he went there first; but if it was not then on his watch-chain, a probability would be established that he went first to Woodford. Thus, you see, a question which may conceivably become of the most vital moment in determining the succession of property turns on the observation or non-observation by this housemaid of an apparently trivial and insignificant fact. ”
