Abstract
The outstanding result of these experiments is the great hardiness of the nymphs of Libellula pulchella. They lived very well for more than six months in alternating foul and fresh water. They lived apparently unharmed in water as strongly acid as pH 1.0, with more or less indifference to the degree of acidity present. The literature I know of that deals in pH values seems to agree that the animals experimented on succumb to a pH of 5.0, and select an environment with a reaction around neutrality. Of nine species of fish, the selection ranged from pH 6.8 to 8.0. Furthermore, the nymphs of Libellulu pulchella are apparently uninjured by a temperature distinctly greater than that of mammalian blood.
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