. Behavior of the lower organisms. Animal behavior; Invertebrates. REACTIONS OF INFUSORIA TO LIGHT AND TO GRAVITY 145 If the experiments were made with swarm spores that were nega- tive to the intensity of light used, they gathered of course in the shadow instead of in the light. If a board was placed across the middle of the vessel from right to left, such swarm spores formed a collection in the partly shaded region at the edge of the board (as in Fig. 96), where they found the optimum degree of illumination. They were repelled both by the strong light and by the deep shadow. Thus it is clear
. Behavior of the lower organisms. Animal behavior; Invertebrates. REACTIONS OF INFUSORIA TO LIGHT AND TO GRAVITY 145 If the experiments were made with swarm spores that were nega- tive to the intensity of light used, they gathered of course in the shadow instead of in the light. If a board was placed across the middle of the vessel from right to left, such swarm spores formed a collection in the partly shaded region at the edge of the board (as in Fig. 96), where they found the optimum degree of illumination. They were repelled both by the strong light and by the deep shadow. Thus it is clear that in the swarm spores, as in Euglena and Stentor, a change in the intensity of illumination produces reaction. But a certain amount of change is required before any effect is produced. If the intensity of illumination changes only very gradually from one. 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 Jennings, H. S. (Herbert Spencer), 1868-1947. New York, The Columbia university press, The Macmillan company, agents; [etc. , etc. ]
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