Subdural inoculation of tubercle bacilli of established virulence for guinea pigs and rabbits, produces in the dog a tuberculous meningitis, followed by paralysis and death. When suspensions of canine leucocytes are injected subdurally, following such inoculations there occurs uniformly a delay in the development of the paralysis and a prolongation of the life of the treated animal. In dogs inoculated with small doses of tubercle bacilli of low virulence, the development of paralysis has been prevented by this means for periods of seven months (up to the present date), while the untreated animals injected with the same cultures have all developed paralytic symptoms within a period of about four weeks.

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