What are the similarities and differences between William Wordsworth's poems "Lines Written in Early Spring" and "I Wandered Lonely as a Cloud"?

In both "Lines Written in Early Spring" and "I Wandered Lonely as a Cloud," the poet uses observations of nature to overcome a sensation of sadness or depression. For instance, in "Cloud," the poet uses first the sight, and then the memory, of beautiful daffodils to overcome a melancholy mood. Likewise, in "Early Spring" Wordsworth's observations of the natural world help alleviate certain melancholy feelings brought on by, as Wordsworth's speaker says, "What man has...

In both "Lines Written in Early Spring" and "I Wandered Lonely as a Cloud," the poet uses observations of nature to overcome a sensation of sadness or depression. For instance, in "Cloud," the poet uses first the sight, and then the memory, of beautiful daffodils to overcome a melancholy mood. Likewise, in "Early Spring" Wordsworth's observations of the natural world help alleviate certain melancholy feelings brought on by, as Wordsworth's speaker says, "What man has made of man" (8). 

The main difference between the poems is how they end. For instance, "Cloud" ends on a positive note, with Wordsworth's recollections of the natural world allowing him to overcome further bouts of sadness. In contrast, Wordsworth seems to end "Early Spring" in a dejected mood, as he sees the beauty of nature as a far cry from an apparently corrupted human society (the poem ends with "Have I not reason to lament / What man has made of man?" (23-24)). As such, though the poems are similar, "Cloud" has a much more positive tone, while "Early Spring" seems pessimistic in regards to the future of human society.