Del Chiaro notices the great imitative capacity of the race, both artistic and mechanical.
Although he made several ingenious improvements in scientific instruments, his mind was rather imitative and critical than creative.
And imitative sounds to represent the cat's mew, the click of a trigger, the clap or thud of a blow, &c. The total result of this combination of gesture and significant sound will be a general system of expression, imperfect but serviceable, and naturally intelligible to all mankind without distinction of race.
Still, the lower animals make no approach to the human system of natural utterance by gesturesigns and emotional-imitative sounds, while the practical identity of this human system among races physically so unlike as the Englishman and the native of the Australian bush indicates extreme closeness of mental similarity throughout the human species.
When, however, the Englishman and the Australian speak each in his native tongue, only such words as belong to the interjectional and imitative classes will be naturally intelligible, and as it were instinctive to both.