_Geometrical Curiosity._--Take half a sheet of note-paper; fold and crease
it so that two opposite corners exactly meet; then fold and crease it so
that the remaining two opposite corners exactly meet. Armed with a fine
pair of scissors, proceed now to repeat both these folds alternately
without cessation, taking care to cut off quite flush and clear all the
overlappings on both sides after each fold. When these overlappings become
too small to be cut off, _the paper is in the shape of a circle_, _i. e._
the ultimate intersection of an infinite series of tangents. Perhaps
PROFESSOR DE MORGAN will give the _rationale_ of this procedure.