This section is from "The Horticulturist, And Journal Of Rural Art And Rural Taste", by P. Barry, A. J. Downing, J. Jay Smith, Peter B. Mead, F. W. Woodward, Henry T. Williams. Also available from Amazon: Horticulturist and Journal of Rural Art and Rural Taste.
The French have several little ways of verification, which we have not yet put in practice. If you purchase a looking-glass in Paris, the vender hands you a candle, and asks you to write your autograph on the face; notwithstanding this verification, we have never been quite sure that a purchase in that line was not somehow (possibly by a transfer of the candle-grease to another glass) unverified. But let that pass. The adjoining little cut represents an instrument for the verification of your tree purchases; where suspicion exists, it will be a very handy article to bring out of a waistcoat pocket The little pincer allows you to place a marked lead above a knot, by a string or cord, by which you verify your tree when it gets home. It is a common pincer, having at its extremities two points, upon which numbers or letters at a and b are engraved; pinched slightly into the knot or bark, your string sustains a lead with a similar indentation, enabling you to be perfectly satisfied that you have obtained what you purchased.
It is the invention of M. Arnheiter, and engraved for a late number of the Revue Horticole.