Abstract
DR. GRIFFIN has recently published1 some further observations on the cries of bats, which are of great interest. He demonstrates clearly that the pulse of sound is often extremely short, having a duration which usually does not exceed 2.3 milliseconds. He also finds that the frequency of the supersonic tone alters during the pulse, having a frequency, for example, of 80 kc. at the beginning, dropping to less than 50 kc. at the end. This drop of somewhat less than an octave seems to be typical. The records which Dr. Griffin has obtained are very convincing on both these points.
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Nature, 158, 46 (1946).
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HARTRIDGE, H. Supersonic Cries of Bats. Nature 158, 135 (1946). https://doi.org/10.1038/158135a0
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DOI: https://doi.org/10.1038/158135a0
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