On Thu, 10 Sep 2009 15:32:15 +0100, "ian field"
wrote:


"John Larkin" wrote in message
.. .
On Thu, 10 Sep 2009 00:14:26 -0700, life imitates life
wrote:

You do know what pond scum predominantly is, right?


Algae. Small plants powered by sunlight.

John


http://www.microscopy-uk.org.uk/inde...ond/index.html


That is what LIVES in the pond. The "pond scum" is the refuse and
corpses of what lives/lived in the pond.