Living hydras in permanent aquaria, undisturbed. Living hydras in small aquaria, i.e herunterladen. tumblers, test tubes, watch glasses, etc., with pieces of water weed and if possible some of the microscopic animals found in water where hydras are abundant herunterladen. If kept cool, hydras may live several days in such aquaria. Permanent slides of hydras; some whole, some in sections, and some showing the organs of reproduction microsoft office kostenlos downloaden vollversion deutsch chip.