in Thoreau’s Journal:
Within little more than a fortnight the woods, from bare twigs, have become a sea of verdure, and young shoots have contended with one another in the race. The leaves have unfurled all over the country like a parasol.
Shade is produced, and the birds are concealed and their economies go forward uninterruptedly, thousands of worms and insects are preying on the leaves while they are young and tender. Myriads of little parasols are suddenly spread all the country over, to shield the earth and roots of the trees from parching heat, and they begin to flutter and rustle in the breeze.