Mashup of extracts from three texts:

• William Baldwin (1584) Beware the Cat. [a 16th century English protonovel about a priest who creates a potion that allows him to hear the speech of animals]
• Quotes from Lazzaro Spallanzani in Sven Dijkgraaf (1961) Spallanzani's Unpublished Experiments on the Sensory Basis of Object Perception in Bats. Isis 51(1). [Lazzaro Spallanzani was an eighteenth century scientist and catholic priest from Italy. He was one of the earliest individuals to create experimental data indicating that bats might perceive with their ears, not their eyes]
• Donald Griffin (1974) Listening in the Dark: the acoustic orientation of bats and men. Toronto: Dover Publications. [In which Griffin recounts how he obtained definite proof of the ultrasound emitted by bats using apparatus developed by G. W. Pierce.]