We can here see a little better how the use of speech became established, and insensibly improved in each family, and we may form a conjecture also concerning the manner in which various causes may have extended and accelerated the progress of language, by making it more and more necessary. Floods or earthquakes surrounded inhabited districts with precipices or waters: revolutions of the globe tore off portions from the continent, and made them islands. It is readily seen that among men thus collected and compelled to live together, a common idiom must have arisen much more easily than among those who still wandered through the forests of the continent. Thus it is very possible that after their first essays in navigation the islanders brought over the use of speech to the continent: and it is at least very probable that communities and languages were first established in islands, and even came to perfection there before they were known on the mainland. Everything now begins to change its aspect. Men, who have up to now been roving in the woods, by taking to a more settled manner of life, come gradually together, form separate bodies, and at length in every country arises a distinct nation, united in character and manners, not by regulations or laws, but by uniformity of life and food, and the common influence of climate. Permanent neighbourhood could not fail to produce, in time, some connection between different families. Among young people of opposite sexes, living in neighbouring huts, the transient commerce required by nature soon led, through mutual intercourse, to another kind not less agreeable, and more permanent. Men began now to take the difference between objects into account, and to make comparisons; they acquired imperceptibly the ideas of beauty and merit, which soon gave rise to feelings of preference. In consequence of seeing each other often, they could not do without seeing each other constantly. A tender and pleasant feeling insinuated itself into their souls, and the least opposition turned it into an impetuous fury: with love arose jealousy; discord triumphed, and human blood was sacrificed to the gentlest of all passions.