Note 8 — Chapter VI · MODIFIED CIRCUMNUTATION: SLEEP OR NYCTITROPIC MOVEMENTS, THEIR USE: SLEEP OF COTYLEDONS.
Reading edition
Martins in ‘Bull. Soc. Bot. de France,’ tom. xix. 1872. Wells, in his famous ‘Essay on Dew,’ remarks that an exposed thermometer rises as soon as even a fleecy cloud, high in the sky, passes over the zenith.