AN investigation into some aspects of electrical injury is at present being carried out on guinea pigs. In an attempt to establish basic conditions, thereby enabling a `standard' electric shock to be inflicted, some time has been devoted to the determination of skin resistance. The resistance of intact dry skin varied between wide limits and was influenced by many factors. The range was 12,000-20,000 Ω. A sub-dermal electrode reduced this to about 5,000 Ω.