My girlfriend's scheming up some kind of project, and she has requested a list of neat old-fashioned terms used in science. I don't know what she's up to, but it sounded fun. They don't necessarily have to be old, but they have to sound romantical. I was surprised out how few I could think of. I'm sure there are tons, but I seem to be blanking. My list so far only includes the luminiferous aether and "spiritus sylvestre", an old name for carbon dioxide. So I thought I'd ask the Physics forums. What are your favorite swoon-inducing phrases from the history of science?