  A micro-boat self-propelled by a camphor engine, carrying seed crystals of
FeCl3, promoted the evolution of chemical gardens when placed on the surface of
aqueous solutions of potassium hexacyanoferrate. Inverse chemical gardens
(growing from the top downward) were observed. The growth of the inverse
chemical gardens was slowed down with an increase in the concentration of the
potassium hexacyanoferrate. Heliciform precipitates were formed under the
self-propulsion of the micro-boat. A phenomenological model, satisfactorily
describing the self locomotion of the camphor-driven micro-boat, is introduced
and checked.
