This essay is no longer available from this web site.  It has been incorporated into a comprehensive collection of Perls's early writings:

From Planned Psychotherapy to Gestalt Therapy: Essays and Lectures — 1945 - 1965 — Frederick Salomon Perls, M.D.

which is available in both print and eBook formats from Amazon at:

http://www.amazon.com/From-Planned-Psychotherapy-Gestalt-Therapy/dp/0939266903