Except in appearance, the transparent little water flea called Daphnia magna is a good deal like a human being. In the words of Professor Arno Viehoever of the Philadelphia College of Pharmacy & Science, who finds Daphnia useful for testing drugs, "this little animal has a divine simplicity that is miraculous. Its fundamental biological responses are very similar to ours. It has nervous, digestive, circulatory, respiratory, optic and reproductive systems. . . ."
Another experimenter with Daphnia is Professor Arthur Mangun Banta of Brown University. Dr. Banta has found that the average water flea which has all it wants to eat from...
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