What we see here is usually called a "hay infusion". What is a hay infusion? Well, many young (and older) microscopists have heard about the world in a drop of water only to be very disappointed by finding very little if anything in pond water. Though pond water contains microbes that can be seen even by using cheap toy microscopes, they typically aren't very dense, making them very hard to find.
The solution to this dillema is known as a
pond water is poured into a container stuffed
with dried grass (such as lawnmower clippings). The theory is that the dried grass is food for the
bacteria already present and these are eaten by the microbes, resulting in a population explosion! Always
being eager to experiment, and not having any pondwater available, I decided to take fresh plucked green
grass, stuff it in a vial, and add "aged" tap water (chlorine removed). The result can be seen here.
After just 48 hours there were already microbes in abundance! Dried grass would work better and pond
water would give a better variety of microbes but this experiment shows that
even green grass and plain
water will work.
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