Filtrates of Fresh Tumor Injected Prior to Transplantation of the Homologous Tumor. ∗

Summary

In 6 experiments involving 66 rabbits, Berkefeld “V”, “N” and Seitz filtrates of fresh Brown-Pearce tumor tissue did not contain evidence of the specific XYZ or lyophilization factor, although the factor has been uniformly present in Berkefeld “V” filtrates of tumor tissue after prolonged freezing