1.   In some copies the obituary also misstated the date of an achievement ascribed to Dr. Demikhov by the Russian news agency Itar-Tass.

2.   The obituary also misstated the given name of her first husband in some copies.

3.   The obituary also misstated the name of a university at which Mr. Brinnin taught.

4.   The obituary also misstated the year that Dr. Brutten founded the Vanguard School in Paoli, Pa., for children with learning disabilities.