It was at that time divided into two factions, the one composed of Vorticists, and the other of Attractionists. Olibrio, an able geometrician and great natural philosopher, founded the sect of the Vorticists. Circino, an able natural philosopher and great geometrician, was the first Attractionist. Both Olibrio and Circino proposed to explain nature. Olibrio’s principles have at first sight a certain air of simplicity, which seduces: in the gross they account for the principal phenomena, but they contradict themselves in the detail. As for Circino, he seems to set out upon an absurdity; but ’tis the first step alone that is expensive. The minute details, which ruin Olibrio’s system, establish his. He follows a road, dark at entrance, but which grows more lightsome according as a person advances. On the contrary, that of Olibrio, lightsome at entrance, grows darker and darker. The philosophy of the latter requires less study than understanding. One cannot be a disciple of the former, without a large share of understanding and study. One enters without preparation into Olibrio’s school; everybody has the key of it. That of Circino is open to none but geometricians of the first class. Olibrio’s Vortices are within the reach of all capacities.