46 As servus was the name of the genus, and verna of the species, without any correlative, this forms a strong presumption that the latter were by far the least numerous. It is a universal observation which we may form upon language that where two related parts of a whole bear any proportion to each other in numbers, rank, or consideration, there are always correlative terms invented which answer to both the parts, and express their mutual relation. If they bear no proportion to each other, the term is only invented for the less, and marks its distinction from the whole. Thus man and woman, master and servant, father and son, prince and subject, stranger and citizen are correlative terms; but the words—seaman, carpenter, smith, tailor, etc., have no correspondent terms which express those who are no seaman, no carpenter, etc. Languages differ very much with regard to the particular words where this distinction obtains, and may thence afford very strong inferences concerning the manners and customs of different nations. The military government of the Roman emperors had exalted the soldiery so high that they balanced all the other orders of the state; hence miles and paganus became relative terms, a thing till then unknown to ancient, and still so to modern languages. Modern superstition has exalted the clergy so high that they overbalance the whole state; hence clergy and laity are terms opposed in all modern languages, and in these alone. And from the same principles I infer that if the number of slaves bought by the Romans from foreign countries had not extremely exceeded those bred at home, verna would have had a correlative which would have expressed the former species of slaves; but these, it would seem, composed the main body of the ancient slaves, and the latter were but a few exceptions.