. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 48 WM. A. KEPNER AND W. H. TALIAFERRO. acid they ceased to show any exploratory movements. Perhaps this loss of the exploratory movements may be accounted for by injury of the ciliated pits. Usually the specimens would be unable to free themselves from the acid and would die. A 1/50 per cent, acetic acid solution was tried with similar results. Thus it is seen that both 1/25 per cent, or 1/50 per cent, acetic acid are dangerous—even fatal media to Microstoma. Therefore .1 per cent, and .05 per cent, common salt solutions wer
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 48 WM. A. KEPNER AND W. H. TALIAFERRO. acid they ceased to show any exploratory movements. Perhaps this loss of the exploratory movements may be accounted for by injury of the ciliated pits. Usually the specimens would be unable to free themselves from the acid and would die. A 1/50 per cent, acetic acid solution was tried with similar results. Thus it is seen that both 1/25 per cent, or 1/50 per cent, acetic acid are dangerous—even fatal media to Microstoma. Therefore .1 per cent, and .05 per cent, common salt solutions were tried. The first experiment was made upon an animal seventeen hours after removal from the pond. The animal was placed in a .1 per cent, salt solution and left to find the drop of fresh water which was placed in the center. The animal's course is indicated in text-figure 4. When the animal entered the fresh water it continued straight across it until it came to the far side of the drop, then it would turn away from the ciliated pit lying nearest the salt solution. By repeating this reaction to contacts with the salt solution the specimen would rotate in the drop of fresh FIG. 5. Diagram indicating the path of a specimen when placed in .1 per cent, salt solution and encountering a drop of fresh water. The dotted line indicates the contour of the enclosed drop of fresh water surrounded by .1 per cent, salt solution. We made only one experiment within twenty-four hours after the specimens wrere removed from the pond. Five days later specimens were taken from the same aquarium which furnished the last one. These specimens showed no definite reaction to the fresh water when they were treated like the specimen referred to in text-figure 4. The course of one of these is shown in text-. 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 perfectl
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
