Description: Segment 1 The spontaneous movements of spirochaeta pallida are shown in high magnification. The formation of chains and loops is shown. Spirochaetes form clusters. Gradual decomposition of spirochaetes is shown. Time start: 00:00:00:00 Time end: 00:06:52:03 Length: 00:06:52:03 Segment 2 The effect of the extract of lympatic organs from immunised animals is shown. At first, the spirochaetes are mobile, then some become motionless. The effects grow and more become motionless. Granulations form in slightly swollen spirochaetes. Progressive granular decay of spirochaetes is shown, with numbers of bacteria diminishing. Time start: 00:06:52:03 Time end: 00:13:58:19 Length: 00:07:06:16