8A80.92 - Pond Scum

Code Number:
8A80.92
Demo Title:
Pond Scum
Condition:
Excellent
Principle:
Evolution
Area of Study:
Primitive Life
Equipment:
Video Microscope, Pond Scum ( dirt in water ), Microscope Slides and Slip Covers.
Procedure:

Place some dirt in water at least 24 hours in advance of the demonstration.  When ready for the demo, take about two drops of the water and place it on the microscope slide.  Observe the multitude and variety of the microscopic creatures.

References:
  • Wayne O. Williams, "Glass Tubing Microscope", TPT, Vol. 17, #3, Mar. 1979, p. 204, also A Potpourri of Physics Teaching Ideas - Tricks of the Trade, p. 350.
  • 50 Fun Experiments for the Mad Scientist in You, "Grow Your Own Biofilm", National Geographic Kids, p.  40.
  • Bathroom Readers' Institute, "A Visit to Microbia", Uncle John's Bathroom Reader for Kids - Did You Know?, p 86.

Disclaimer: These demonstrations are provided only for illustrative use by persons affiliated with The University of Iowa and only under the direction of a trained instructor or physicist.  The University of Iowa is not responsible for demonstrations performed by those using their own equipment or who choose to use this reference material for their own purpose.  The demonstrations included here are within the public domain and can be found in materials contained in libraries, bookstores, and through electronic sources.  Performing all or any portion of any of these demonstrations, with or without revisions not depicted here entails inherent risks.  These risks include, without limitation, bodily injury (and possibly death), including risks to health that may be temporary or permanent and that may exacerbate a pre-existing medical condition; and property loss or damage.  Anyone performing any part of these demonstrations, even with revisions, knowingly and voluntarily assumes all risks associated with them.