As respects the terms employed in navigation, it will have been observed, that they are all connected with its rudest form, that of rowing; and that they do not include the words for mast, yard, or sail, in all of which the two tongues appear to be entirely separated. Again, it may be stated generally, that society in its very earliest stages has little to do with the use of metals. This rule will be of various application, according to their abundance or scarcity in various countries, and according to the facility with which they are convertible to the uses of man. As the objects of enjoyment multiply with the continuance and growth of industry, the precious metals become more desirable with a view to exchange. But the principal metal for direct utility is iron: and of that, the quantity known and used by the Greeks would appear, even in the time of Homer, to have been extremely small. The use of metal for works of art, and probably also for commercial exchange, would seem to have been derived from Phœnician, not Pelasgian sources; and we have no proof that when Homer lived they had acquired the art in any high degree for themselves. The absence of any great progress in the use of metals may thus be set down as a sign of Pelasgianism. And now let us compare the Greek and Roman names for the metals respectively: 1. χρυσὸς, aurum. 2. ἄργυρος, argentum. 3. χαλκὸς, æs. 4. σίδηρος, ferrum. 5. μόλιβος, plumbus: in later Greek μόλυβδος, the form nearest to the Latin. 6. κασσίτερος, stannum. Here also there is a great want of correspondence. Only in iron and lead, and possibly in silver, are there signs of relationship: but in all it is remote. In the other metals it is entirely wanting; and in those which are nearest, it amounts only to presumptive derivation from a common root. The want of community in this class of terms seems to show, that the race which was the common factor of the two nations, was probably not advanced in the use of metals beyond their elementary purposes. I will only further observe, that while so many names indicative of social and domestic relations are akin, nothing can be more clearly separate than the Greek δοῦλος and the Latin _servus_. From this fact it would be no improbable inference, that slavery was unknown to the Pelasgians: and their ignorance of it would, on the other hand, be in the closest harmony with their slight concern in warlike and in maritime pursuits; since captivity in the one, and kidnapping through the other, were the two great feeders of the institution. It is also in close correspondence with the further hypothesis, which represents the Pelasgians as probably the race that first occupied the Greek soil, and found no predecessors upon it over whom to establish political or proprietary dominion[546].