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 Tobaccoes.' In it I enumerate a hundred and forty forms of cigar-, cigarette-, and pipe-tobacco, with colored 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.