There are at present three theories of the origin of language in the field. The Onomatopoetic Theory. According to this the words of a language are imitations of the sounds of nature. The Interjectional Theory. According to this roots are involuntary interjections . . .
Roots are phonetic types and embodiments of general ideas . . .
The sounds uttered by men. These are articulate sounds, which are letters, or are made up of several letters placed together. The question how man came to utter articulate sounds is of a different nature. Here we have simply to understand the double nature of the sounds of the external world. Because it is this double nature of the sounds which will enable us in our future study to see the elements of truth that exist in the onomatopoetic and interjectional theories.