92 A. M. Mayer—Researches in Acoustics. 
attempt, or even suggestion, as to their uses, affects a physicist 
with feelings analogous to those experienced by one who 
peruses a well classified catalogue descriptive of physical instru- 
ments, while of the uses of these instruments he is utterly 
ignorant. 
The following views, taken from the ‘“ Anatomy of the In- 
vertebrata by G. Th. v Siebold,” will show how various are 
the opinions of naturalists as to the pee and form of the 
organs of hearing in the Insecta. “There is the same uncer- 
olfactory organs). Experience having long shown that most 
insects perceive sounds, this sense has been located sometimes 
in this and sometimes in that organ. But in their Sites it 
often seems S ate been forgotten, or unthought of, that there 
convex spots at the base of the antennz of Blatta orientalis, 
and which Treviranus has described as auditory organs, are, as 
Burmeister has correctly stated, only rudimentary resect! 
eyes. Newport and Goureau think that the antennz serve both as 
tactile and as auditory organs. But this view is inadmissible, 
as Erichson has already stated, except in the sense that the 
antenne, like all solid bodies, may conduct sonorous vibrations 
of the air; but, even admitting this view, where is the auditory 
nerve? for it is not at all supposable that the antennal nerve 
can serve at the same time the function of two distinct senses.) 
“Certain Orthoptera are the only Insecta with which there 
has been discovered, in these later times, a single organ having 
the conditions essential to an auditory apparatus. This ih F an 
apes with the Acridide, of two fossse or conchs, surroun ed 
thoracic ganglion, forms a anne on the ty pen ae and 
terminates in the immediate n a: of the la shiae by a 
collection of cuneiform, staff: taff like with very finely- 
pointed extremities ae Gee peer ?), which are sur- 
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