> Little life forms running amuck
>
> Petri simulates life forms living in petri dishes. You create your
> own species, make as many little life forms as you wish, and let
> them go. You control the environment, the species behavior, and
> discover what works and what doesn't.
>
> Petri's Easy view lets you skip the genetics and make simple species
> that are fun to play with while learning how to use Petri's
> features. Petri's Expert view lets you create species with a mix of
> genetic traits and behaviors-the children can inherit different
> traits from their parents, and as a group the species can adapt to
> the environment.
>
> Petri's Easy view has interface elements (icons, pictures) which
> help early reading children recognize parts of the program. Easy
> view was tested on a first grader ... she loves squirting life forms
> into her dish and watching them eat each other.

Download #1: Petri 1.0, encoded as a [Mar archive][1]
Download #2: Petri 1.0.1 (68k)
Download #3: Petri 1.0.1 (PPC)
Download #4: Petri 2.0 (68k)
Download #5: Petri 2.0 (PPC)

Compatibility
Architecture: 68k

Petri requires System 7 and a color display. A big dish of life forms
can take up to 4 MB of memory.

  [1]: http://macintoshgarden.org/apps/mar