Synthesis of macromolecules and morphogenesis in Acetabularia / J. Brachet -- Biochemical studies of male gametogenesis in liliaceous plants / Herbert Stern and Yasuo Hotta -- Specific interactions between tissues during organogenesis / Etienne Wolff -- Low-resistance junctions between cells in embryos and tissue culture / Edwin J. Furshpan and David D. Potter -- Computer analysis of cellular interactions / F. Heinmets -- Cell aggregation and differentiation in Dictyostelium / Günther Gerisch -- Hormone-dependent differentiation of mammary gland in vitro / Roger W. Turkington.