single subject, is always eager for new inquiries; and in proportion as the intellectual eye takes in a wider prospect, it must be gratified with variety by more rapid flights and bolder excursions; nor perhaps can there be proposed to those who have been accustomed to the pleasures of thought, a more powerful incitement to any undertaking, than the hope of filling their fancy with new images, of clearing their doubts, and enlightening their reason.

When Jason, in Valerius Flaccus, would incline the young prince Acastus to accompany him in the first essay of navigation, he disperses his apprehensions of danger by representations of the new tracts of earth and heaven which the expedition would spread before their eyes; and tells him with what grief he will hear, at their return, of the countries which they shall have seen, and the toils which they have surmounted.

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Acastus was soon prevailed upon by his curiosity to set rocks and hardships at defiance, and commit his life to the winds; and the same motives