Harris discovered a corrrespondence between random walk excursions and random trees whose continuous analog relates a Brownian excursion to Aldous's concept of a continuum random tree. This idea has been developed and applied in various ways by Neveu, Le Gall and others.I will review these ideas in terms of a forest growth process, originallydevised by Aldous to describe the asymptotics of large finite trees, but nowrelated to the structure of a Brownian path exposed by sampling at the timesof points of an independent Poisson process.Reference: Chapter 6 of "Combinatorial Stochastic Processes", available viahttp://stat-www.berkeley.edu/users/pitman/bibliog.html