2 D. Immunological Response . . . . . . . . . . . . . . . . . . . . 78 1. Thymectomy in LDV Infection . . . . . . . . . . . . . . . . 81 2. Effect of LDV Infection on Immune Response to Various Antigenic Stimuli. . . . . 82 E. Tumour Growth . . 87 F. Histological Changes 91 VII. Ecology . . . . . . . 97 VIII. Laboratory Methods. . 100 A. Blood Samples from Mice for LDH Estimation . 100 B. Estimation of Plasma LDH Activity . . 101 1. Quantitative Methods. . . . . . . . 101 a) Determination of Plasma LDH by Spectrophotometric Method (Backward Reaction) . . . . . . . . . . . . . . . 101 b)...