The origin of language. Krissia Liliana Dìaz Cornejo | Seite 6

The natural sound source.
The "bow-wow"theory holds
that vocabulary developed
from imitations of animal
noises, such as: Moo, bark,
hiss, meow, quack-quack.
 In other words, the first
human words were a type of
index, a sign whose form is
naturally connected with
its meaning in time and
space.