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 following account of a new kind of garden pot appears in the Revue Horticole. An English amateur, Mr. Keir, residing in Paris, has contrived a method by which the branches of trees can be more conveniently layered than heretofore. Pots with a slit on one side have been long in use; but difficulty has been found in their use out of doors, on account of the want of any good means of securing them in a fixed position or at any desired height. Mr. Keir proposes to make such pots with a tubular projection on one side (a b) through which a staff may pass, and, being driven into the ground, hold the pot perfectly steady.
The adjoining cut explains at a glance the nature of the invention. In forming such a pot, it is said that the potter must take care that the slit c is so small as just to allow the branch d to pass in without leaving room for the earth to slip out. But this precaution seems needless; for it would be easy to prevent the earth slipping by means of pebbles or crocks applied to the slit after the branch is inserted, and as the pot is being filled with earth.
 
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