This is his description of a lake storm, during an excursion to the Albanian Mountains:
As far as Ostia 'he had a delightful voyage; at night the sea began to be most unwontedly troubled, and a severe storm arose. The east wind rolled up the waters from their lowest depths, huge waves beat the shore; you could have heard the sea, as it were, groaning and wailing. So great was the force of the winds, that nothing seemed able to resist it; they raged and alternately fled and put one another to rout, they overturned woods and anything that withstood them. The air glittered with frequent lightning, the sky thundered, and terrific thunder-bolts fell from the clouds.... The night was pitch dark, though the flashes of lightning were continuous.'
And of a lake at rest he says:
'The beauty of that lake is remarkable; everywhere it is surrounded by high rocks, the water is transparently clear. Nature, so far superior to art, provided a most pleasant journey. The Nemorian lake, with its crystal-clear waters, reflects the faces of those that look into it, and fills a deep basin. The descent from the top to the bottom is wooded. The poetic genius would never be awakened if it slept here; you would say it was the dwelling-place of the Muses, the home of the Nymphs, and, if there is any truth in legends, the hiding-place of Diana.'
He visited the lakes among the mountains, climbing and resting under the trees; the view from Monte Cavo was his favourite, from which he could see Terracina, the lakes of Nemi and Albano, etc. He noted their extent and formation, and added:
'The genista, however, was especially delightful, covering, as it did with its flowers, the greater part of the plains. Then, moreover, Rome presented itself fully to the eyes, together with Soracte and the Sabine Land, and the Apennine range white with snow, and Tibur and Præneste.'
It is clear that it was a thoroughly modern enthusiasm which attracted Æneas Sylvius to the country and gave him this ready pen for everything in Nature--everything, that is, except bare mountain summits.
It is difficult to attribute this faculty for enjoying and describing scenery to the influence of antiquity alone, for, save the younger Pliny, I know of no Roman under the Empire who possessed it, and, besides, we do not know how far Pius II. was acquainted with Roman literature. We know that the re-awakening of classic literature exerted an influence upon the direction of the feeling for Nature in general, and, for the rest, very various elements coalesced. Like times produce like streams of tendency, and Hellenism, the Roman Empire, and the Renaissance were alike to some extent in the conditions of their existence and the results that flowed from them; the causal nexus between them is undeniable, and makes them the chief stepping-stones on the way to the modern.
Theocritus, Meleager, Petrarch, and Æneas Sylvius may serve as representatives of the development of the feeling for Nature from classic to modern; they are the ancestors of our enthusiasm, the links in the chain which leads up to Rousseau, Goethe, Byron, and Shelley.
From the autobiography of Æneas Sylvius and the lyrics of Petrarch we gain a far truer picture of the feeling of the period up to the sixteenth century than from any poetry in other countries. Even the epic had a more modern tone in Italy; Ariosto's descriptions were far ahead of any German epic.