The Theory of Moral Sentiments by Adam Smith

The assignation of particular names to denote particular objects, that is, the institution of nouns substantive, would, probably, be one of the first steps towards the formation of language. Two savages, who had never been taught to speak, but had been bred up remote from the societies of men, would naturally begin to form that language by which they would endeavour to make their mutual wants intelligible to each other, by uttering certain sounds, whenever they meant to denote certain objects. Those objects only which were most familiar to them, and which they had most frequent occasion to mention would have particular names assigned to them. The particular cave whose covering sheltered them from the weather, the particular tree whose fruit relieved their hunger, the particular fountain whose water allayed their thirst, would first be denominated by the words cave, tree, fountain, or by whatever other appellations they might think proper, in that primitive jargon, to mark them. Afterwards, when the more enlarged experience of these savages had led them to observe, and their necessary occasions obliged them to make mention of other caves, and other trees, and other fountains, they would naturally bestow, upon each of those new objects, the same name, by which they had been accustomed to express the similar objects they were first acquainted with. The new objects had none of them any name of its own, but each of them exactly resembled another object, which had such an appellation. It was impossible that those savages could behold the new objects, without recollecting the old ones; and the name of the old ones, to which the new bore so close a resemblance. When they had occasion, therefore, to mention or to point out to each other, any of the new objects, they would naturally utter the name of the correspondent old one, of which the idea could not fail, at that instant, to present itself to their memory in the strongest and liveliest manner. And thus, those words, which were originally the proper names of individuals, would each of them insensibly become the common name of a multitude. A child that is just learning to speak, calls every person who comes to the house its papa or its mamma; and thus bestows upon the whole species those names which it had been taught to apply to two individuals. I have known a clown, who did not know the proper name of the river which ran by his own door. It was the river, he said, and he never heard any other name for it. His experience, it seems, had not led him to observe any other river. The general word river, therefore, was, it is evident, in his acceptance of it, a proper name, signifying an individual object. If this person had been carried to another river, would he not readily have called it a river? Could we suppose any person living on the banks of the Thames so ignorant as not to know the general word river but to be acquainted only with the particular word Thames, if he was brought to any other river, would he not readily call it a Thames? This, in reality, is no more than what they, who are well acquainted with the general word, are very apt to do. An Englishman, describing any great river which he may have seen in some foreign country, naturally says, that it is another Thames. The Spaniards, when they first arrived upon the coast of Mexico, and observed the wealth, populousness, and habitations of that fine country, so much superior to the savage nations which they had been visiting for some time before, cried out, that it was another Spain. Hence it was called New Spain; and this name has stuck to that unfortunate country ever since. We say, in the same manner, of a hero, that he is an Alexander; of an orator, that he is a Cicero; of a philosopher, that he is a Newton. This way of speaking, which the grammarians call an antonomasia, and which is still extremely common, though now not at all necessary, demonstrates how mankind are disposed to give to one object the name of any other, which nearly resembles it, and thus to denominate a multitude, by what originally was intended to express an individual.

It is this application of the name of an individual to a great multitude of objects, whose resemblance naturally recalls the idea of that individual, and of the name which expresses it, that seems originally to have given occasion to the formation of those classes and assortments, which, in the schools, are called genera and species, and of which the ingenious and eloquent M. Rousseau of Geneva finds himself so much at a loss to account for the origin. What constitutes a species is merely a number of objects, bearing a certain degree of resemblance to one another, and on that account denominated by a single appellation, which may be applied to express any one of them.