Alone, engrossed, the least frequented strands

I traverse with my footsteps faint and slow,

And often wary glances round me throw,

To flee, should human trace imprint the sands.

(Sonnet 28.)

A life of solitude I've ever sought,

This many a field and forest knows, and will.

(Sonnet 221.)

Love of solitude and feeling for Nature limit or increase each other; and Petrarch; like Dante, took scientific interest in her, and found her a stimulant to mental work.

Burckhardt says: 'The enjoyment of Nature is for him the favourite accompaniment of intellectual pursuits; it was to combine the two that he lived in learned retirement at Vaucluse and elsewhere, that he from time to time fled from the world and from his age.'