. Biological lectures delivered at the Marine Biological Laboratory of Wood's Holl [sic]. Biology. 176 BIOLOGICAL LECTURES, drop down to a position in which the approaching hght will be at right angles to their surfaces. Plate No. 11 is a photograph of RJLododendro7i maxuniini taken at an altitude of over 4000 feet. It developed itself entirely in the sunshine. It shows the upper, or young leaves, erected vertically upward until they are nearly parallel with the sun's rays during the hotter portion of the day. The leaves below, which are more or less horizontal, are more than one year old. At
. Biological lectures delivered at the Marine Biological Laboratory of Wood's Holl [sic]. Biology. 176 BIOLOGICAL LECTURES, drop down to a position in which the approaching hght will be at right angles to their surfaces. Plate No. 11 is a photograph of RJLododendro7i maxuniini taken at an altitude of over 4000 feet. It developed itself entirely in the sunshine. It shows the upper, or young leaves, erected vertically upward until they are nearly parallel with the sun's rays during the hotter portion of the day. The leaves below, which are more or less horizontal, are more than one year old. At the end of the. Plate No. ii. first year, the upper leaves, having become tough and coria- ceous, will assume a position parallel to the older ones below\ In Plate No. 12 is shown a photograph of RJiododcndron cataivbicnse at the same altitude, but standing in a thoroughly shaded spot. Although a different species, the action of the leaves is the same. It will be seen that the vounsr and urowins: leaves above \)\\\ themselves quickl)- in a ]iosition jiarallel with the leaves below during development. The differences between the microscopic structures of the leaves exposed to direct sunlight and of those wholly shaded. 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 Marine Biological Laboratory (Woods Hole, Mass. ). Boston, Ginn & Co
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectbiology
