Antisepsis and gas lamp: what they have in common

1. Step 1. Antisepsis — evolved into — Sterilization. Asepsis replaced Lister’s antisepsis.
2. Step 2. Sterilization — uses — Autoclave. Sterilization by steam.
3. Step 3. Autoclave — has part — Safety valve. A safety valve releases pressure.
4. Step 4. Safety valve — is a kind of — Valve. A kind of valve.
5. Step 5. Valve — is part of — Gas lamp. A gas supply valve.

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