immobilized enzymes, antibodies, and antigens. In the final section, research workers describe and discuss the perspectives of immobilized enzymes and proteins. Here, they speculate on the future potential of possible approaches, even though these may not have been extensively studied or tested at the laboratory stage. The biomedical applications of enzymes and proteins, especially in the thera­ peutic area, is in a very early stage of development. Much remains to be explored and studied, and the area is wide open for investigators interested in original research in a new interdisciplinary area. References Chang, T. M. S., 1972, Artificial Cells, Charles C. Thomas, Publisher, Springfield, Ill. Dunlop, R. B. (ed.), 1974, Immobilized Biochemicals and Affinity ChrOTIULtography, Plenum Press, N ew York.