The annual meeting of the European Tissue Culture ., Society was held at the Castle of Zinkovy in Czechoslovakia from May 7-10,1969. Included as part of this meeting was a symposium on "Aging in Cell and Tissue Culture." This volume contains the papers presented at that symposium. The use of cell and tissue culture techniques to study the mechanism of aging is not new. For example, it has long been known that age-associated changes which occur in plasma can inhibit cell proliferation in vitro; also that the time lapse prior to cell migration from ex planted tissue fragments increases with...