. The Biological bulletin. Biology; Zoology; Marine biology. 312 CHARLES HAIG The filters absorbed such large quantities of light that it was found necessary in the blue-green and minus-blue regions to increase the exposure time to 10 seconds, and in one case to 30 seconds, in order to obtain sufficient energy to complete the curves. This involves the assumption that the Bunsen-Roscoe relation holds for Avena. Justifi- cation for this assumption is supplied by Blaauw's (1909) results, which indicate that for a given bending response of this plant the product of intensity and time is a constant
. The Biological bulletin. Biology; Zoology; Marine biology. 312 CHARLES HAIG The filters absorbed such large quantities of light that it was found necessary in the blue-green and minus-blue regions to increase the exposure time to 10 seconds, and in one case to 30 seconds, in order to obtain sufficient energy to complete the curves. This involves the assumption that the Bunsen-Roscoe relation holds for Avena. Justifi- cation for this assumption is supplied by Blaauw's (1909) results, which indicate that for a given bending response of this plant the product of intensity and time is a constant over enormous ranges of intensity. Logarithm of Relative Energy Fig. 3. Relation between reaction time and log relative energy for responses of Avena to three regions of the spectrum. Each point is the average of 6 measurements on naked coleoptiles (Table II). Circles, filter 75 (blue-green); squares, filter 12 (minus-blue); triangles, filter 76 (violet). Open squares and circles represent 10- second exposures, and the solid square a 30-second one. The open triangles represent 1 second and the solid triangles 10-second exposures: Note that they all fall on the same curve. and time. But in order to be quite sure that the procedure was sound, complete 1 and 10-second exposure curves were obtained for violet light (Filter No. 76). It will be seen from Fig. 3 that the 10-second readings (solid triangles) agree very well with those resulting from 1-second exposures (open triangles). Figure 3 also reveals that no tip curve could be obtained when the violet filter was used, indicating that in the spectral region transmitted by this filter, base responses have lower thresholds than tip 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 Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield,
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