1. Neither cannabichromene (CBC) nor delta 9-tetrahydrocannabinol (THC) protected mice from electroshock-induced seizures, although THC inhibited postictal mortality. Minor effects were produced on seizure latency and duration. 2. CBC had a weak analgetic action in mice; THC had a moderate and lengthy effect, which was potentiated at 2 hr by concurrent CBC. 3. Both CBC (10-75 mg/kg, i.p.) and THC (20 mg/kg) reduced motility of mice, the THC equalling the highest dose of CBC. 4. Performance of a conditioned avoidance response was strongly impaired by THC, but not by CBC, nor did CBC combined with THC have influence on the effects of THC.