General physiology; an outline of the science of life . A B Fig. 185.—Pelomyxa,palustris. A, Unstimulated, creeping ; B, stimulated, contracted. form extended, sudden illumination had the effect that has beenspoken above in connection with chemical, mechanical and thermalstimulation. The protoplasmic body contracted suddenly into aball, and all motion ceased, to reappear at once, however, upondarkening. Slow increase in the intensity of the light from dark-ness on had no decided influence. The protoplasmic masses of manyMyxomycetes, which likewise show contraction-phenomena uponphotic stimulat
General physiology; an outline of the science of life . A B Fig. 185.—Pelomyxa,palustris. A, Unstimulated, creeping ; B, stimulated, contracted. form extended, sudden illumination had the effect that has beenspoken above in connection with chemical, mechanical and thermalstimulation. The protoplasmic body contracted suddenly into aball, and all motion ceased, to reappear at once, however, upondarkening. Slow increase in the intensity of the light from dark-ness on had no decided influence. The protoplasmic masses of manyMyxomycetes, which likewise show contraction-phenomena uponphotic stimulation, behave in all respects similarly. Engelmann, who has made many discoveries concerning thephysiology of the unicellular organisms, found also a peculiarBacterium, which proved extraordinarily sensitive to photic form, which Engelmann (83) called Bacterium photometricum,moves about actively in a drop of water by the stroke of the flagellumwhich the ends of the body of every motile Bacterium bear. Thismotion continues only so long as
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Keywords: ., bookcentury1800, bookdecade1890, bookidgen, booksubjectphysiology
