Outlines of General Biology An Introductory Laboratory Manual
Outlines of General Biology An Introductory Laboratory Manual
Charles Wesley Hargitt
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On the out- side of the aquarium make a mark to locate the position of an individual. Make several observations after some hours or days and determine whether the specimen has moved. 4. Heliotropism, or movements in response to light. Ex- amine hydra in the aquarium. Are specimens arranged 78 GENERAL BIOLOGY or distributed in any special relation to light? Note where the specimens are most abundant, rotate the jar 90 to 180 degrees and observe again after several days. Have the hydras retained ...the old position or are they in a new part of the jar? Are they in the same position, relative to the source of light, that they were before the jar was moved? 5. Food Taking. It is possible to artificially feed specimens by suspending bits of raw beef within reach of the tentacles, or by placing it in watch glasses with hydra. The method of capturing prey may often be observed by placing water- fleas in a jar or watch glass containing hydra. 6. Reproduction. (a) Asexual. The presence of buds has already been noted.
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