 The distribution of the venom of the Chinese cobra has been studied in mice using a whole-animal radiographic technique.Results indicate that venom accumulates primarily in the kidney (marked localization in the cortex) with little or no activity in the brain of mice sacrificed one to two minutes after intravenous injection of massive dose levels of venom.Using I-labelled cobra venom ("Naja atra"), 1 μg/g mice, its isolated I-neurotoxin (0.2 μg/g) or cardiotoxin (4 μg/g), it has been found that, after subcutaneous injection into the thigh, the neurotoxin was more rapidly absorbed than either crude venom or cardiotoxin.