. Beihefte zum botanischen Centralblatt. Plants. N"ewcomb'e, Gravitation sensitiveness not confined to apex of root. 107 Observation was next made attheend of The two roots which previously were found straight had now beut outward 15 ° and 20° respectively, while one root formeiiy curved had wholly straightened. During all these tests, the damp Chamber always con- tained several centimeters of free water in addition to that held in the filter-paper lining the Chamber; as stated before, my damp- chambers were closed against the loss of Fig. 5. Seedling of Vicia faba. Meth
. Beihefte zum botanischen Centralblatt. Plants. N"ewcomb'e, Gravitation sensitiveness not confined to apex of root. 107 Observation was next made attheend of The two roots which previously were found straight had now beut outward 15 ° and 20° respectively, while one root formeiiy curved had wholly straightened. During all these tests, the damp Chamber always con- tained several centimeters of free water in addition to that held in the filter-paper lining the Chamber; as stated before, my damp- chambers were closed against the loss of Fig. 5. Seedling of Vicia faba. Method of bending when opposed by bar of cork. The foregoing result would seem to demonstrate the geo- tropic sensitiveness of the part of the root behind the apical 3 mm. There can be no doubt that the curves are not plastic. Some, however, may hesitate to pronounce against the possible participation of hyclrotropism and thigmotropism in producing the curves when the corkbars were employed. Such doubters are re- ferred to my papers on The Rheotropism of Eoots!) and Thigmotro- pism of Terrestrial Roots2), in which it is shown that, even in un-. 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 Leipzig : Verlag von G. Thiem
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