He has the power of observation and that of deduction.
He is only wanting in knowledge, and that may come in time.
He is now translating my small works into French."
"Your works?"
"Oh, didn't you know?" he cried, laughing.
"Yes, I have been guilty of several monographs.
They are all upon technical subjects.
Here, for example, is one 'Upon the Distinction between the Ashes of the Various Tobaccos.' In it I enumerate a hundred and forty forms of cigar, cigarette, and pipe tobacco, with coloured plates illustrating the difference in the ash.
It is a point which is continually turning up in criminal trials, and which is sometimes of supreme importance as a clue.
If you can say definitely, for example, that some murder had been done by a man who was smoking an Indian lunkah, it obviously narrows your field of search.