title: Aging in Irradiated and Nonirradiated Hydras.
abstract: Evidence is presented that as hydras become older they bud more slowly and become more susceptible to adverse conditions. In these studies, a 2000-roentgen dose of x-radiation did not seem to affect the rate of these changes. The mean number of tentacles did not change with age.
authors.forename: J R
authors.initials: JR
authors.lastname: Stevenson
authors.forename: R
authors.initials: R
authors.lastname: Buchsbaum