56 healthy rabbits were inoculated with the active Cysticercus each into lateral ventricle of the brain, the white substance of the brain and into Spatium subarachnoideale. Rabbits were killed after 32 weeks p.i. Then their brains were macro- ev. microscopically investigated. The positive seroreactions (ringpreciptitation reaction and the latex-test) were observed at the beginning of the second week after infection. Curve of the titers was revealed two tops: first one between 6-7 weeks, second one 16-22 weeks after infection. All rabbits except one reacted positive on the application of the Cysticercus antigen. The control group consisted of the 8 rabbits revealed negative serological and immunological reactions. Three groups of the cerebral cysticercosis, dependent on the localization of the cysticerci in the brains, were observed: oedema form, hydrocephalous form and tumor form. These forms as well as the symptoms are similar to the human cerebral cysticercosis.