Mast, Samuel Ottmar, b.1871 · New York, J. Wiley & Sons; [etc., etc.] · leaf 79
of the plumule cast on a white surface temporarily arrangedfor the purpose (Fig. 6). The intensity of light to which the plumules were ex-posed varied from about 2 to 14 ca. m. In most of theexperiments they were exposed to the lowest intensity, theedge of the plumule at the beginning of the…
Light -- Physiological effect · Phototropism
Internet Archive · Biodiversity Heritage Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-114-50.webp)
