1. Lot no. 6001, fraction 5, Blutspendedienst, Schweizerisches Rotes Kreuz, Berne.
2. We are grateful to Dr. W. von Orelli, Sandoz S.A., Basle, for supplying us with rat pancreas, and to Dr. J. Schlichtkrull, Novo Terapeutisk Laboratorium AS, Copenhagen, for the preparation of the rat insulin.
3. We thank Dr. W. M. Mikulaschek, Eli Lilly & Co., Indianapolis, Indiana, for this material and for support of this work.
4. Liver Circulation and Function