Famous quotes containing the words single and/or species:
“A single gentle rain makes the grass many shades greener. So our prospects brighten on the influx of better thoughts.”
—Henry David Thoreau (1817–1862)
“Genius detects through the fly, through the caterpillar, through the grub, through the egg, the constant individual; through countless individuals the fixed species; through many species the genus; through all genera the steadfast type; through all the kingdoms of organized life the eternal unity. Nature is a mutable cloud which is always and never the same.”
—Ralph Waldo Emerson (1803–1882)