Sax Rohmer,
Bat Wing — Chapter VII
(1921)
“ IN CERTAIN moods Paul Harley was impossible as a companion, and I, who knew him well, had learned to leave him to his own devices at such times. These moods invariably corresponded with his meeting some problem to the heart of which the lance of his keen wit failed to penetrate. His humour might not display itself in the spoken word, he merely became oblivious of everything and everybody around him. People might talk to him and he scarce noted their presence, familiar faces appear and he would see them not. ”
