Reversible Bleaching of Chlorophyll in vivo: J. W. Coleman, A. S. Holt, E. Rabinowitch .... ...................... 795 Clot-Retraction Promoting Factor (Retractin) in Platelets and Tissues: S. I. Magalini and M. Stefanini ..... ...................... 796 Inhibition of Aerobic Phosphorylation and Pasteur Reaction by an Adrenal-Cortical Extract: Z. Miller ..... ........................ 797 Tergal...