Edward Sapir (18841939). Language: An Introduction to the Study of Speech. 1921.
English are, just so, suggested by a common natural prototype, the instinctive cries, and are thus unavoidably suggestive of each other. They differ, now greatly, now but little, because they are builded out of historically diverse materials or techniques, the respective linguistic traditions, phonetic systems, speech habits of the two peoples. Yet the instinctive cries as such are practically identical for all humanity, just as the human skeleton or nervous system is to all intents and purposes a fixed, that is, an only slightly and accidentally variable, feature of mans organism.
Interjections are among the least important of speech elements. Their discussion is valuable mainly because it can be shown that even they, avowedly the nearest of all language sounds to instinctive utterance, are only superficially of an instinctive nature. Were it therefore possible to demonstrate that the whole of language is traceable, in its ultimate historical and psychological foundations, to the interjections, it would still not follow that language is an instinctive activity. But, as a matter of fact, all attempts so to explain the origin of speech have been fruitless. There is no tangible evidence, historical or otherwise, tending to show that the mass of speech elements and speech processes has evolved out of the interjections. These are a very small and functionally insignificant proportion of the vocabulary of language; at no time and in no linguistic province that we have record of do we see a noticeable tendency towards their elaboration into the primary warp and woof of language. They are never more, at best, than a decorative edging to the ample, complex fabric.
What applies to the interjections applies with even greater force to the sound-imitative words. Such words as whippoorwill, to mew, to caw are in no sense