. Rustic sounds and other studies in literature and natural history. Galton, Francis, Sir, 1822-1911; Austen, Jane, 1775-1817; Hales, Stephen, 1677-1761; Darwin, George Howard, Sir, 1845-1912; Natural history. 212 PICTURESQUE EXPERIMENTS they are the gate-keepers who regulate both export and import. They are known by actual inspection (with a microscope) to close at night: the result of this is that the evaporation of the leaves is much slower at night, and this is true when allowance has been made for the fact that evaporation is also checked at night by the dampness of the Fig. 7. The
. Rustic sounds and other studies in literature and natural history. Galton, Francis, Sir, 1822-1911; Austen, Jane, 1775-1817; Hales, Stephen, 1677-1761; Darwin, George Howard, Sir, 1845-1912; Natural history. 212 PICTURESQUE EXPERIMENTS they are the gate-keepers who regulate both export and import. They are known by actual inspection (with a microscope) to close at night: the result of this is that the evaporation of the leaves is much slower at night, and this is true when allowance has been made for the fact that evaporation is also checked at night by the dampness of the Fig. 7. The microscopical inspection of stomata is not a completely satisfactory method of discovering to what degree they are open. It has, however, been my good fortune to resuscitate and simplify a method of studying the stomatal condition. The method was many years ago tried in a hopelessly cumbersome form by a German, but never came into use. My apparatus is described in the Pro- ceedings of the Royal Society,^ and is known as the ' A new method of estimating the aperture of stomata. B., Vol. 84, 1911,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Darwin, Francis, Sir, 1848-1925. London, Murray
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