Anatomical Study of Plants Grown Under Glasses Transmitting Light of Various Ranges of Wave Lengths

Abstract

Some sort of diagram, which would bring all these organs and their development into one view, seems a useful sort of summary. Table VI serves this end. Usually outdoors plants take the first place, with the full-spectrum plants usually second, and visible-spectrum plants third. Except in height, which is the least tractable of the figures to handle, minus-violet-house and shade plants usually fall close together, and the blue- and red-house plants are generally at the end of the series, showing weaker development and differentiation. In the full-spectrum and visible-spectrum houses quality of light determines the difference, since the intensities are similar. In the remaining houses, both quality and intensity may be effective in bringing about the changes.