The Second Conference of the International Society of Hemorheology took place under the auspices of the University of Heidelberg from July 27 - August 1,1969 in Heidel berg. At this conference the name of the Society was changed to THE INTERNA TIONAL SOCIETY OF BIORHEOLOGY, since the members decided to enlarge the scope of the Society to include all fields of biorheology. Meanwhile the Society has become an Affiliated Commission of the International Union of Pure and Applied Biophysics. The abstracts of the scientific papers, as they appeared in the program of the Confe rence, have been...