On the 15 of May we celebrated the 150th anniversary of the outstandin
g Russian biologist Elias E. Metchnikoff (1845-1916)-Nobel Prize winne
r (1908), full and honorary member of many scientific academies of the
world. His main works were applied to the zoology of invertebtates, e
volution, embryology, immunology, microbiology, infectious pathology,
gerontology, etc. Elias Metchnikoff published essays on anthropology,
theory of orthobiosis, role of social and social-hygienic factors in s
olving the problems of old age and life elongation. On 30 May-2 June 1
995 an International Symposium dedicated to Metchnikoff's 150th annive
rsary was held in Moscow. This is a text of the lecture given by us at
the opening ceremony.